passages.id: split_5_test_2921_passage
passages.type: progene_text
passages.text: Meanwhile , the tyrosine phosphorylation of STAT1 of NK cells was quickly induced , but other pathways including STAT3 , STAT6 , ERK1 / 2 , p38 MAPK , JNK / SAPK , PI-3K , NF-kappaB were not or only weakly activated .