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The reconstruction of a fragment of primordial genetic information from modern proteins: PGI-FI (AHAP).

In a continuation of earlier studies the connection between a reconstructed ancestral histone IV peptide and various sequences from non-histone proteins was investigated. This peptide, AHAP, was found to be related to partial peptides from the human encephalitogenic protein, immunoglobulin L-chains, fibrinopeptide A, glyceraldehyde-3-phosphate-dehydrogenase, TMV coat protein and several other proteins and protein families; for comparison, nodal sequences were employed wherever possible. The widespread occurrence of genetic information expressed in AHAP caused us to rename the peptide PGI-FI (primordial genetic information-fragment 1) since this peptide is apparently part of a very primitive and ancient genetic information, and may be called "protogene".