tokens: Two - dimensional gel electrophoresis of anti - p59fyn immunoprecipitates obtained from non - transformed resting human T lymphocytes resulted in the identification of an oligomeric protein complex which is constitutively formed between Fyn and several additional phosphoproteins ( pp43 , pp72 , pp85 , the protein tyrosine kinase Pyk2 , as well as the two recently cloned adaptor proteins , SKAP55 and SLAP - 130 ) .