Table 3.

GC content of the 1st, 2nd and 3rd codon positions (with s.e.). Where multiple individuals were taken for any one species, a single sequence was selected at random.

		GC% and codon position
group	number of species	1st	2nd	3rd
chimaerids	3	52.24±0.40	42.33±0.08	34.97±2.40
sharks & rays	61	53.54±0.19	42.71±0.02	29.89±0.90
teleosts	143	57.11±0.10	42.63±0.02	41.05±0.50