since methylation of acidic residues on erythrocyte membrane proteins has been detected exclusively on d-aspartic acid residues ( mcfadden , p. n. , and clarke , s. ( 1982 ) proc . natl . acad . sci . u. s. a . 79 , 2460-2464 ) , these results are consistent with an accumulation of d-aspartic acid in membrane protein due to spontaneous racemization a the cell ages .
C0033684
proteins
C0025252
membrane protein