title: IgM the secretory immunoglobulin of reptiles and amphibians.
mesh_terms: D000818:Animals; D005075:Biological Evolution; D007075:Immunoglobulin M / Q000032:analysis / Q000096:biosynthesis*; D008970:Molecular Weight; D011892:Rana catesbeiana / Q000276:immunology*; D012911:Snakes / Q000276:immunology*; D014426:Turtles / Q000276:immunology*
chemical_list: D007075:Immunoglobulin M