Table 1

		1	2	3	4
		U	C	A	G
1	UU	5’ – UUU = F AAA – 5’	5’ – UUC = F AAG – 5’	5’ – UUA = L AAU – 5’	5’ – UUG = L AAC – 5’
2	UC	5’ – UCU = S AGA – 5’	5’ – UCC = S AGG – 5’	5’ – UCA = S AGU – 5’	5’ – UCG = S AGC – 5’
3	UA	5’ – UAU = Y AUA – 5’	5’ – UAC = Y AUG – 5’	5’ – UAA = * AUU – 5’	5’ – UAG = * AUC – 5’
4	UG	5’ – UGU = C ACA – 5’	5’ – UGC = C ACG – 5’	5’ – UGA = * ACU – 5’	5’ – UGG = W ACC – 5’
5	CU	5’ – CUU = L GAA – 5’	5’ – CUC = L GAG – 5’	5’ – CUA = L GAU – 5’	5’ – CUG = L GAC – 5’
6	CC	5’ – CCU = P GGA – 5’	5’ – CCC = P GGG – 5’	5’ – CCA = P GGU – 5’	5’ – CCG = P GGC – 5’
7	CA	5’ – CAU = H GUA – 5’	5’ – CAC = H GUG – 5’	5’ – CAA = Q GUU – 5’	5’ – CAG = Q GUC – 5’
8	CG	5’ – CGU = R GCA – 5’	5’ – CGC = R GCG – 5’	5’ – CGA = R GCU – 5’	5’ – CGG = R GCC – 5’
9	AU	5’ – AUU = I UAA – 5’	5’ – AUC = I UAG – 5’	5’ – AUA = I UAU – 5’	5’ – AUG = M UAC – 5’
10	AC	5’ – ACU = T UGA – 5’	5’ – ACC = T UGG – 5’	5’ – ACA = T UGU – 5’	5’ – ACG = T UGC – 5’
11	AA	5’ – AAU = N UUA – 5’	5’ – AAC = N UUG – 5’	5’ – AAA = K UUU – 5’	5’ – AAG = K UUC – 5’
12	AG	5’ – AGU = S UCA – 5’	5’ – AGC = S UCG – 5’	5’ – AGA = R UCU – 5’	5’ – AGG = R UCC – 5’
13	GU	5’ – GUU = V CAA – 5’	5’ – GUC = V CAG – 5’	5’ – GUA = V CAU – 5’	5’ – GUG = V CAC – 5’
14	GC	5’ – GCU = A CGA – 5’	5’ – GCC = A CGG – 5’	5’ – GCA = A CGU – 5’	5’ – GCG = A CGC – 5’
15	GA	5’ – GAU = D CUA – 5’	5’ – GAC = D CUG – 5’	5’ – GAA = E CUU – 5’	5’ – GAG = E CUC – 5’
16	GG	5’ – GGU = G CCA – 5’	5’ – GGC = G CCG – 5’	5’ – GGA = G CCU – 5’	5’ – GGG = G CCC – 5’

Table 1: Nirenberg’s first 16x4=64 codon/anticodon table (shown here for the first time in its complete form), being the codons with their anti-sense complements reordered according to the now-classical sequence of U, C, A, G [4,5], from top to bottom, and from left to right; in bold italics their corresponding amino acids; also shown, the direction of the start, or 5’– from left-to-right for the codons that codify in the upper lines, and from –5’, from right-to-left for the non-coding codons in the lower lines below the previous ones; this table has been modified from [3]: Here, the columns of the x axis have been numbered.