Abstract
Summary
Histocompatibility (HL-A) antigens were demonstrated on 95% of 217 cultured adult human fibroblast strains using a microcytoxicity method. Four of eight lines established from human tumors showed no HL-A reactivity. By contrast, no loss of HL-A reactivity was found in fibroblast strains transformed in vitro by simian virus 40 (SV40) or murine sarcoma virus (Kirsten strain).
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