Reduced birefringence of cpr5 mutant trichomes when viewed by polarized light. Samples were illuminated by plane polarized light and viewed through an analyzer filter oriented at right angles to the polarizing filter. When oriented appropriately relative to the filters, birefringent materials result in the transmission of light through the analyzer. In panels (A), (C), and (E), the trichome branch indicated by the arrow is oriented to transmit maximum light, indicative of the degree of birefringence. In panels (B), (D), and (F), the stage has been rotated relative to the polarizing filters such that the same trichome branch transmits a minimum amount of light. The samples are: Col-0 wild-type, (A) and (B); cpr5-1, (C) and (D);cpr5-2, (E) and (F).