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9 Biochem. J. (1973) 135, 9-10 Printed in Great Britain IUPAC-IUB Commission on Biochemical Nomenclature Amendments and Corrections (1973) Rules for Naming Synthetic Modifications of Natural Peptides [Biochem. J. (1967) 104, 17-19] To resemble exactly the isotopic replacement system (e.g. [14C]urea), remove hyphens after the square brackets and close up (i.e. leave no space after the brackets) in: Rule 1, sentence 1: twice Rule 1, examples: four times Rule 1, comment (f): three times Summary (table), 1. Replacement: once In the last case, for instance, it should be [Phe4]iupaciubin, not [Phe4]-iupaciubin. Nomenclature for Vitamins B6 and Related Compounds [Biochem. J. (1970) 119, 14] These Rules have now become definitive and have been published by IUPAC only, in Pure Appl. Chem. (1973) 33, 447450. The following amendments have been incorporated into this final definitive version. In the title and throughout the document, B6 1 should be B-6, to conform to the style chosen by IUNS and AIN, and to be compatible with computer languages. In the Introduction, sentence 2, after '3-hydroxy4,5-bis(hydroxymethyl)-2-methylpyridine' add a footnote sign (O). The new footnote is to read: 't The systematic name, by IUPAC Organic Rule C-204.1, is 4,5-bis(hydroxymethyl)-2-methyl-3-pyridinol.' The same footnote sign (t) should appear in the middle of sentence 1 of Rule 7.1, after '3-hydroxy-4,5-bis(hydroxymethyl)-2-methylpyridine'. At the end of paragraph 3, after 'pyridoxol', add '(see 7.1 below)'. In footnote 1, after 'this document is' insert 'a revision of the previous Tentative Rules [IUPAC Vol. 135 Information Bulletin Appendix No. 6, September 1970; Biochem. J. (1970) 119, 1-4; and elsewhere], which were, in turn'. In footnote 2, change '1970' to '1972', eliminate 'E. C. Slater', add 'B. L. Horecker' and change 'this document' in the last sentence to 'the Tentative Rules'. In Rules, sentence 1, after 'for all' insert '3-hydroxy-'; in the same sentence, after 'qualitatively' insert 'in rats'. In 7.1, add the footnote sign (t) referred to above after '3-hydroxy-4,5-bis(hydroxymethyl)-2-methylpyridine', strike out 'or pyridoxol' and add a second footnote (§) dropped from 'pyridoxine' to read: '§ The previous synonym (see Introduction and Ref. 1) is no longer recommended.'. In 7.6, examples, after '2-propyl-2-norpyridoxal' add ', 2'-ethylpyridoxal (not w-ethylpyridoxal)'. Insert a new entry between the fourth and fifth entries, to read: '2'-hydroxypyridoxal (2-hydroxymethyl-2desmethylpyridoxal, 2-hydroxymethyl-2-norpyridoxal, not w-hydroxypyridoxal)'. In 7.9, second entry should read '6-[3H]methylpyridoxamine-[32P]P'. In the References, the exact Ref. 5 is (1970) 40, 395; the exact Ref. 6 is (1971) 101, 133; the exact Ref. 9 is IUPAC Information Bulletin Appendix No. 9, February 1971; Biochem. J. (1970) 120, 449; and elsewhere. Symbols for Amino-Acid Derivatives and Peptides. Recommendations (1971) Biochem. J. (1972) 126, 773-780 In Section 3.5, example 1, >Glu should be <Glu. In Section 5, -CO-Gly should be Ph-CO-Gly. In Section 6.3.2, in the oxytocin structure the Asn and Gln residues should be in reverse order. 10 IUPAC-IUB COMMISSION All Tentative Rules and Proposals of the IUPAC-IUB Commission on Biochemical Nomenclature (CBN) are available from Waldo E. Cohn, Director, NAS-NRC Office of Biochemical Nomenclature, Oak Ridge National Laboratory, P.O. Box Y, Oak Ridge, Tenn. 37830, U.S.A.: 1. Abbreviations and Symbols for Chemical Names of Special Interest in Biological Chemistry [see Biochem. J. (1966) 101, 1-7 (extended by items 6, 11 and 15 below)]. 2. Nomenclature of Vitamins, Coenzymes and Related Compounds: Trivial Narnes of Miscellaneous Compounds of Importance in Biochemistry, Nomenclature of Quinones with Isoprenoid Side Chains, Nomenclature and Symbols for Folic Acid and Related Compounds, Nomenclature of Corrinoids. Tentative Rules [see Biochen. J. (1967) 102, 15-22 (but see item 10 below)]. 3. Abbreviated Designation of Amino Acid Derivatives and Peptides [see Biochem. J. (1967) 102, 23-27 (superseded by item 15 below)]. 4. Rules for Naming Synthetic Modifications of Natural Peptides (see Biochem. J. (1967) 104, 17-19 (for amendments see item 20 below)]. 5. The Nomenclature of Lipids. A Document for Discussion [see Biochem. J. (1967) 105, 897-902]. 6. Abbreviated Nomenclature of Synthetic Polypeptides (Polymerized Amino Acids) [see Biochem. J. (1968) 106, 577-579 (superseded by item 18 below)]. 7. The Nomenclature of Cyclitols. Tentative Rules [see Biochem. J. (1969) 112, 17-28]. 8. A One-Letter Notation for Amino Acid Sequences. Tentative Rules [see Biochem. J. (1969) 113, 14]. 9. Revised Tentative Rules for Nomenclature of Steroids [see Biochem. J. (1969) 113, 5-28 (for amendments see item 16 below)]. 10. Nomenclature for Vitamins B6 and Related Compounds. Tentative Rules [see Biochem. J. (1970) 119, 1-4 (replaces M7 of item 2 above; for amendments see item 20 below)]. 11. Abbreviations and Symbols for Nucleic Acids, Polynucleotides and their Constituents. Recommendations [see Biochem. J. (1970) 120, 449-454 (replaces section 5 of item 1 above)]. 12. Abbreviations and Symbols for the Description of the Conformation of Polypeptide Chains. Tentative Rules (see Biochem. J. (1971) 121, 577-585]. 13. Tentative Rules for Carbohydrate Nomenclature: Part 1 [see Biochem. J. (1971) 125, 673-695]. 14. The Nomenclature of Multiple Forms of Enzymes. Recommendations [see Biochem. J. (1 972) 126, 769-771 ]. 15. Symbols for Amino Acid Derivatives and Peptides [see Biochem. J. (1972) 126, 773-780 (supersedes item 3 above; for corrections see item 20 below)]. 16. Amendments to Rules for Nomenclature of Steroids [see Biochem. J. (1972) 127, 613-617 (amendments to item 9 above)]. 17. Tentative Rules for the Nomenclature of Carotenoids [see Biochem. J. (1972) 127, 741-752]. 18. Abbreviated Nomenclature of Synthetic Polypeptides (Polymerized Amino Acids). Revised Recommendations [Biochem. J. (1972)127,753-756 (supersedes item 6 above)]. 19. Nomenclature of Iron-Sulphur Proteins. Recommendations [see Biochem. J. (1973) 135, 5-7]. 20. Amendments and Corrections [this document (amendments and corrections to items 4, 10 and 15 above)]. A document, OBN-5, describing the (American) NAS-NRC Office of Biochemical Nomenclature, and listing other rules affecting biochemical nomenclature, is available from its Director, Dr. Waldo E. Cohn [see also J. Chem. Doc. (1967) 7, 72-73; (1969) 9, 235-241]. 1973