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The antimicrotubular drug ethyl-TV-phenylcarbamate (EPC), at 1 to 10 mM, strongly inhibits gravitropism in coleoptiles of Zea mays L. Under the same conditions, phototropism remains essentially unimpaired. Propyzamide, a antimicrotubular drug specific for plant microtubules, at 0.02 to 0.2 mM causes qualitatively identical results, but to a weaker extent. Immunofluorescence data show that even only partial elimination of cortical microtubules in the outer epidermis is correlated with completedoi:10.1093/oxfordjournals.pcp.a078155 fatcat:np6dyzqq6ja5hfnzeturo7umfq