Table 2. Average molecular evolutionary rates for cephalochordate GFP-encoding genes within each species.

	DJC	DPois	Dn	Ds	Dn/Ds
A. lucayanum	0.649	0.809	0.562	1.033	0.544
B. belcheri	0.506	0.640	0.433	0.819	0.532
B. floridae	0.451	0.619	0.392	0.697	0.567
B. lanceolatum	0.202	0.280	0.163	0.357	0.421

D_jc: Jukes-Cantor nucleotide substitution rate; D_Pois: Poisson amino acid substitution rate; D_n: nonsynonymous substitution rate; D_s: synonymous substitution rate.