passages.id: split_8_test_2362_passage
passages.type: progene_text
passages.text: A third isoform of p38 MAPK , known variously as stress - activated protein kinase-3 ( SAPK3 ) , p38- gamma or ERK6 , has been previously shown to differ from p38 - alpha / beta both in its molecular weight and its lack of inhibition by the compound SB203580 .