Expression of total Lyn, p-Lyn^Tyr507, p-Lyn^Tyr396, p-SrcTyr⁴¹⁶, total Btk, p-Btk^Tyr551, and p-Btk^Tyr223 in cell lines was assessed by ICC and Western blotting as described in “Western blot experiments” and “IHC and ICC.” Score of reactivity in ICC stains: + indicates positive; ±, weak reactivity; and −, negative stain. Score for Western blot analysis: + indicates positive;±, weak band; and −, negative.

ICC indicates immunocytochemistry; and nt, not tested.