passages.id: split_1_test_1943_passage
passages.type: progene_text
passages.text: Moreover , immunoblots of lysates precipitated with anti - p56 ( lck ) , phosphotyrosine , or CD4 demonstrated that in FSK - treated , anti - CD3 - stimulated cells , p56 ( lck ) is not associated with CD4 zeta chain , nor is p56 ( lck ) or zeta chain phosphorylated .