title: Preservation of antigenic properties of macromolecules over 70 Myr.
mesh_terms: D000818:Animals; D000937:Antigen-Antibody Reactions; D003429:Cross Reactions; D000939:Epitopes; D005580:Fossils; D005779:Immunodiffusion; D046911:Macromolecular Substances; D008974:Mollusca / Q000276:immunology*; D010163:Paleontology
chemical_list: D000939:Epitopes; D046911:Macromolecular Substances