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SUMMARY: Exhaustive alkali and acid extraction of Mucor mucedo zygospores leaves a residue that is chemically very similar to higher plant and synthetic sporopollenins. This Mucor sporopollenin is probably a component of the outer part of the zygospore wall. The incorporation of radioactive acetate, mevalonate and β-carotene suggests that it is biosynthesized by an oxidative polymerization of β-carotene. Thus sporopollenin formation is probably a role for the increased carotenogenesis observed during sexual reproduction of many members of the Mucorales.
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