However , activation of SYK relies less on phosphorylation by Src family kinases than Zap - 70 .
These non-receptor cytoplasmic tyrosine kinases share a characteristic dual SH2 domain separated by a linker domain .
Activation of SYK relies less on phosphorylation by Src family kinases than Zap - 70 .
These non-receptor cytoplasmic tyrosine kinases share a characteristic dual SH2 domain separated by a linker domain .