methyl esterification of membrane-bound proteins occurred selectively to proteins corresponding to bands 3 ( mol wt 97 000 ) , 4 ( mol wt 75 000 ) , and 4.5 ( mol wt 48 000 ) [ designated according to steck , t. l. ( 1974 ) , j. cell biol . 62 , 1 ] as identified by sodium dodecyl sulfate-polyacrylamide gel electrophoresis .
C0025252
membrane
C0033684
proteins