passages.id: split_9_validation_1384_passage
passages.type: progene_text
passages.text: Single or combined deficiencies in the expression and/or function of TAP , LMP2 , LMP10 and tapasin were demonstrated in 11 of 12 cell lines studied , whereas the expression of calnexin , calreticulin , beta2-microglobulin , LMP7 and PA28alpha was unaltered or only weakly decreased .