tokens: Cross linking the B cell Ag receptor ( BCR ) to surface Fc receptors for IgG ( Fc gamma R ) inhibits G1-to-S progression ; the mechanism by which this occurs is not completely known .
folded_tokens: Cross link the b cell ag receptor ( bcr ) to surface fc receptor for igg ( fc gamma r ) inhibit g1-to-s progression ; the mechanism by which this occur be not completely know .