passages.id: split_1_test_1164_passage
passages.type: progene_text
passages.text: Normal mucosa typically showed a strong protein doublet at 31 and 29 kDa while cancers demonstrated decreased expression or total loss of the 31 kDa protein ( 90 % of cases ) , equal or increased expression of the 29 - kDa protein ( 67 % of cases ) and the new appearance or up - regulation of a cathepsin H band at 22 kDa ( 78 % of cases ) .