Assertion: sea urchin's structure | /r/HasProperty | glycoprotein
Facets:
value: primarily
type: DEGREE
Source sentences:
text: It is a stationary structure with the three parts: the outermost part is made of a jelly-like substance which protects the egg, the second structure is the vitelline layer, which is composed primarily of glycoproteins, and the innermost layer surrounding the genetic information is the plasma membrane, common to all egg cells.