using a modification of the egta treatment of oishi and smith [ oishi , m. , & smith , c. l. ( 1978 ) proc . natl . acad . sci . u.s.a. 75 , 3569 ] , escherichia coli cells have been made permeable to s-adenosylmethionine and other related molecules in order to facilitate the study of methylation in chemotaxis .
C0007634
cells
C0008018
chemotaxis