tokens: We propose that two pathways regulate Stat5 serine phosphorylation , one that is prolactin activated and PD98059 resistant and one that is constitutively active and PD98059 sensitive and preferentially targets Stat5a .
folded_tokens: we propose that two pathway regulate stat5 serine phosphorylation , one that be prolactin activate and pd98059 resistant and one that be constitutively active and pd98059 sensitive and preferentially target stat5a .