Symmetry in a receptor mosaic demonstrated in the chick from the frequencies, spacing and arrangement of the types of retinal receptor.
D000704:Analysis of Variance; D000818:Animals; D002645:Chickens; D008854:Microscopy, Electron; D009030:Mosaicism; D010786:Photoreceptor Cells / Q000033:anatomy & histology*; D012160:Retina / Q000033:anatomy & histology*