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(FRAME-INFO (STRING "Cone Photoreceptors. \(Images compliments of Dr. D. Dacey, Dept. of Biological Structure, University of Washington\). \(A\) Photograph of a stained cone photoreceptor cell in a radial section of macaque monkey retina. The outer segment is at the top of the frame. The magenta line represents the plane of section shown in \(B\), which shows the cone and rod photoreceptor mosaics. Humans and old world monkeys have three cone types with peak sensitivities respectively to short-, mid- and long-wavelengths of light. Rod photoreceptors have a broad spectral sensitivity and are the receptors used in dim light \(scotopic conditions\).  "))