"‘Help’ to B cells is not a single product of TFH cells and not even a single process. T cell help to B cells can be divided into seven distinct functions, ... : proliferation, survival, plasma cell differentiation, somatic hypermutation, class-switch recombination, adhesion and attraction. These seven different forms of help are all contributors to TFH cell–B cell interactions, and each process consists of multiple pathways ... Furthermore, some molecules have a role in several different forms of help."