title: Loss of antigen-antibody affinity with storage of antiserum at-20c.
mesh_terms: D000818:Animals; D000906:Antibodies; D005615:Freezing; D013006:Growth Hormone; D006168:Guinea Pigs; D006801:Humans; D007106:Immune Sera; D011309:Preservation, Biological; D011863:Radioimmunoassay; D013997:Time Factors
chemical_list: D000906:Antibodies; D007106:Immune Sera; D013006:Growth Hormone