| Since tyrosine phosphorylated pp29 / 30 selectively interacts with the Src homology type 2 domains ( SHZ ) of the protein tyrosine kinases p56lck and p59fyn but not ZAP 70 the present data suggest that pp29 / 30 represents a novel signaling receptor associated phosphoprotein likely involved in the activation of human T lymphocytes and NK cells . . ^^^ |