Abstract
From bile of bull frog injected with cholesterol-[C14-4], 3α, 7α, 12α, 26-tetrahydroxy-Δ23-bishomocholene-[C14], 3α7α 12α-trihydroxy-Δ24-homocholene-[C14-4] and a radio-active new bile sterol of m. p. 182-3°C were isolated, and it was confirmed that these sterols were biosynthesized from cholesterol in bull frog.

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