passages.id: split_5_test_3657_passage
passages.type: progene_text
passages.text: Surprisingly , although stimulation of Jurkat T cells with either CHO - CD80 or anti - CD28 mAb resulted in robust tyrosine phosphorylation of CD28 itself , ligation with CHO - CD86 was unable to induce detectable CD28 tyrosyl phosphorylation over a range of stimulation conditions .