title: Protein heterogeneity: its history, its bases, and its limits.
mesh_terms: D000595:Amino Acid Sequence; D004247:DNA; D006454:Hemoglobins / Q000266:history; D049673:History, 20th Century; D006801:Humans; D007136:Immunoglobulins / Q000266:history; D008970:Molecular Weight; D011110:Polymorphism, Genetic; D014176:Protein Biosynthesis; D011506:Proteins / Q000266:history*; D014158:Transcription, Genetic
chemical_list: D006454:Hemoglobins; D007136:Immunoglobulins; D011506:Proteins; D004247:DNA