Table 1.

Prebiotic physicochemical group genetic code^a

2nd 2nd nucleotide	T	C	A	G
Codons	GTG	GCG	CAC	CGC
		ACG		TGC
		GCA		CGT
Amino acids	Hydrophobic nonpolar	Small polar and nonpolar	Dicarbonic	Hydroxy
	Val, n-Val, Leu, n-Leu, Ile, a-But	Ala, Gly [Ser, Asp]	Asp, Glu	Ser [Thr]

^aIf diaminopurine nucleotide (A*) was used for the progene formation instead of adenine nucleotide (A), four codons will be in each column (see Consequences 2 and 3): PuTPu, PuCPu, PyA*Py, PyGPy where Pu—purine (A* or G), Py—pyrimidine (T, U or C)