Fig. 2From: Sea shell diversity and rapidly evolving secretomes: insights into the evolution of biomineralizationSchematic representation of a section through the shell and the mantle of a bivalve mollusc. Green and blue triangles depict organic macromolecules secreted by the mantle. NL: nacreous layer. PL: prismatic layer. P: periostracum. PG: periostracal groove. EPS: extrapallial space. OF: outer fold. MF: middle fold. IF: inner fold. OE: outer epithelium. IE: inner epithelium. PN: pallial nerve. PM: pallial muscle. V: vesicles. EV: exosome-like vesiclesBack to article page