tokens: The Fyn NH2 terminus was necessary but not sufficient for interaction with zeta and both Fyn kinase and SH2 domains were required , directing phosphorylation of zeta ITAM tyrosines and binding to zeta ITAM phosphotyrosines .
folded_tokens: the fyn nh2 terminus be necessary but not sufficient for interaction with zeta and both fyn kinase and sh2 domain be require , direct phosphorylation of zeta itam tyrosine and bind to zeta itam phosphotyrosine .