Differential gene expression profiles of camera eye genes at different developmental stages. The Venn diagram indicates numbers of cephalopod camera eye-specific genes for three cephalopod species (PS, the pygmy squid; S, squid; O, octopus). Each box represent the number of genes expressed at the three embryonic stages of the pygmy squid found in the developmental array. In total, 3,075 genes (2,320, 235 and 519 from PS, S, and O, respectively) were positive against pygmy squid embryonic RNA.
Yoshida and Ogura BMC Evolutionary Biology 2011 11:180 doi:10.1186/1471-2148-11-180