Almost 10 years ago, a study was published which examined the amino acid pairs represented by particular triplet codons and their complementary sequences (anti-sense codons) (Biro, 1981). These complementary amino acid pairs displayed 'hydropathic anti-complementarity' in that hydrophobic residues almost always were partnered with hydrophilic amino acids, whereas amphiphilic residues tended to be paired with other amphiphilic amino acids (Blalock & Smith, 1984). These reports remained no more than interesting observations on the nature of the genetic code until the remarkable finding that the peptides adrenocorticotrophin(1–24) (ACTH(1–24)) and γ-endorphin (a 17-mer) bound specifically and with a relatively high degree of affinity (∼10−6 mol/l) to their respective complementary peptides (CP)—molecules synthezised using a template RNA complementary to the original mRNA for the peptides, translation being in a 5′→3′ direction and in the same reading frame (Bost, Smith & Blalock, 1985a). In the intervening years, evidence for the binding
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