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Synthesis of and chains of rabbit hemoglobin in a cell-free extract from Krebs II ascites cells.

An RNA sedimenting at 10 S, with a molecular weight of 2.3 x 10(5), was isolated from rabbit reticylocyte polyribosomes. When this RNA is added to a cell-free extract from Krebs II ascites cells, both alpha and beta chains of rabbit hemoglobin are synthesized; beta chains are made in about 50% excess over alpha chains.