Abstract
We have studied the production of serum albumin by somatic hybrids between well-differentiated 2 s and 1 s rat hepatoma cells (Faza), which produce serum albumin, and sub-diploid mouse leukemic lymphoblasts (Lc), which do not produce albumin. We determined the rat or mouse origin of the albumin by double immunodiffusion, using immuno-adsorbed noncrossreacting antisera. Each of 12 karyologically identified 2 s hybrid clones (Lc2F) produces both rat and mouse albumin. Moreover, unlike 1 s hybrids reported previously, eight of nine 1 s hybrids (LcF) also produce mouse albumin; six of them produce rat albumin as well. One clone from the 1 s cross produces only rat albumin.