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Abstract
The activator was isolated from the particulates (pptd. at 10,000 r.p.m., 20 min.) of rat liver homogenates by defatting with acetone, and then with chlorform-methanol (2:1), 0.02 [image] HC1 extraction, pptn. at neutral pH, and methanol extraction. It was identified as protohemin IX by paper chromatography and silicic acid column chromatography.

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