Table 2.

Mean percentage base composition (with s.e.), comparing cox1 sequences of chimaerids, sharks and rays, and teleosts. Where multiple individuals were taken for any one species, a single sequence was selected at random.

		% of base
group	number of species	G	C	A	T
chimaerids	3	16.67±0.30	28.13±1.13	25.21±0.06	29.98±0.94
sharks & rays	61	16.75±0.10	25.44±0.25	25.33±0.15	32.48±0.24
teleosts	143	18.31±0.07	28.75±0.15	23.58±0.09	29.38±0.14