Leland Stanford Junior University

Francisco Calvo-Riera

Nelson N Teng

Henry S Kaplan

Kit S Lam

Methods are provided for producing fusion partners which involve employing an immortalized human myeloma cell line sensitive to HAT and having an additional dominant selectable resistance marker and fusing the doubly marked human myeloma cells with a stable immortalized rodent myeloma cell line, desirably previously subjected to substantial chromosome damage, and isolating cells having a substantially complete chromosomal complement of the rodent cell and at least about one chromosome of the human cell having a gene expressing said resistance, thereby being resistant to a selective agent. The resulting heteromyeloma may be fused with high efficiency with human lymphocytes to produce monoclonal antibodies. The cell lines designated as A6 and 36 were deposited at the A.T.C.C. on Jan. 11, 1983 and given accession numbers CRL8192 and CRL8193, respectively.

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Leon, Spain

Francisco Calvo-Riera