phosphatidylcholine is synthesized on the cytoplasmic surface of the endoplasmic reticulum and transported to the lumenal monolayer by a protein transporter , a phosphatidylcholine `` '' flippase '' '' ( bishop , w. r. , and bell , r. m. ( 1985 ) cell 42 , 51-60 ) .
C0010834
cytoplasmic
C0007634
) ce