EOG8P2SKB GO:0042600 1/12 chorion cellular_component "A protective, noncellular membrane that surrounds the eggs of various animals including insects and fish." [GOC:jl, ISBN:0721662544] EOG8P2SKB GO:0007305 1/12 vitelline membrane formation involved in chorion-containing eggshell formation biological_process "Construction of the vitelline membrane portion of a chorion-containing eggshell. An example of this is found in Drosophila melanogaster." [GOC:mah, GOC:mtg_sensu]