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Lymphoblastoid cells were cultured from two Herpesvirus saimiri (HVS) inoculated white-lipped marmosets and from one HVS-inoculated owl monkey. Cells from all three animals grew clumped in suspension. The cells from both species were diploid in chromo-some number and showed no unusual chromosomal abnormalities. The marmoset cell line examined was chimaeric. The marmoset cells lacked HSV-associated antigens as determined by immunofluorescence, and no evidence for the presence of virus was found by either infectivity assays or electron microscopy. Cocultivation of these cells with Vero cells resulted in cytopathology and the recovery of complete, infectious virus. The owl monkey lymphoid cells were positive to a small degree for both viral antigens and infectivity. The cells were resistant to rechallenge with HVS. Cocultivation of these cells with Vero cells led to the development of cytopathology and an increased yield of virus. [ABSTRACT FROM AUTHOR]