Specific collagens and insoluble proteins called cuticlins are major constituents of the nematode cuticles. The epicuticle. which forms the outermost electron-dense layer of the cuticle. is composed of another category of insoluble proteins called epicuticlins. https://www.jmannino.com/super-super-Bamboo-Cloth-Baby-Nappy-White-amazing-save/