Tissue Typing of Cells in Culture. II. Histocompatibility Typing of Diploid Fibroblastic Cultures by the Mixed Hemadsorption (MH) Test

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Abstract
Skin fibroblasts derived from persons who were HLA-typed by conventional lymphocytotoxicity tests were subjected to HLA-typing by the mixed hemadsorption (MH) test. The agreement between the 2 methods was good, provided sera for the MH test were carefully selected. Minor discrepancies found in this study can probably be corrected by further serum selection. There was no difficulty in typing late passages of cultured diploid cells (22 doublings); in fact, it was easier to type a culture at the 33rd doubling than at the 11th. No signs of disappearance of HLA-antigens were seen in these tests.