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The giant sporangiophore of the unicellular zygomycete Phycomyces blakesleeanus displays negative gravitropism. Vacuolar paracrystalline protein bodies, so-called octahedral crystals, function as statoliths of gravitropism. The spectrofluorometric analysis indicates the presence of pterin- and flavin-like pigments that are non-covalently associated with the crystals. The redox states of the pterin-...
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