Sequences of ML1E6 and 6G3, 2 ependymin-related proteins. (A) An alignment of 2 shell matrix ependymin-related proteins. Putative N-glycosylation sites are boxed. Predicted signal peptides are underlined. (B) An alignment of ML1E6 and 6G3 of H. asinina with other mollusc ependymin-related proteins reveals the high degree of conservation of the cysteine residues between the different forms. Positions shaded in black indicate cases where more than 70% of the residues are identical, and grey where at least 40% of the residues are identical or share biochemical similarity with the consensus residue. GenBank or Swiss-Prot numbers are indicated on the left.