if you mean immunohistochemical marker you can use LCA (leukocyte common antigen) to identify both T and B lymphocytes.

Dear Patrick!

You can look at this paper, please

Article Introduction of Zinc-salt Fixation for Effective Detection o...

Table 1

The list of antibodies used for detecting immune cell related markers.

Thanks Alexandr, very interestîng!

LCA

Thanks Peter

LCA or CD45

CD45(LCA) expression.