Fig. 1From: Targeted deletion of liver-expressed Choriogenin L results in the production of soft eggs and infertility in medaka, Oryzias latipesSchematic illustrations of ovulated fish (medaka) and mouse eggs (A and B, respectively). The fish (medaka) egg envelope, also known as the “chorion,” “zona radiata,” and/or “vitelline envelope,” is shown with its two layers — the inner layer (interna) and the outer layer (externa). The single-layer egg envelope in mammals is termed the “zona pellucida”Back to article page