passages.id: split_8_test_2507_passage
passages.type: progene_text
passages.text: After 42d of 60 ppm Paylean , the amount of slow , 2A , and 2AX myosin heavy chain decreased ( P < 0.05 ) across the three muscles whereas the amount of 2B myosin heavy chain increased ( P < 0.05 ) .