Evolution of antibodies. The road not taken.
D000595:Amino Acid Sequence; D000818:Animals; D000906:Antibodies; D005075:Biological Evolution; D003062:Codon; D005796:Genes; D007107:Immune System; D007136:Immunoglobulins / Q000235:genetics / Q000502:physiology; D008322:Mammals / Q000276:immunology*
D000906:Antibodies; D003062:Codon; D007136:Immunoglobulins