The roles of the Drosophila JAK/STAT pathway
... Hop phosphorylation and activation in Clone 8 tissue
culture cells. Furthermore, activation of the JAK/
STAT pathway by Upd does not require co-expression
of Upd in the signaling cell as Upd supplied by either a
physically separate, but co-cultured, (S2) cell type, or
even from previously conditione ...