Table 2.

GC content of the third codon positions (GC3) in coding exons of neurohypophysial hormone genes

		Exon 1	Exon 2	Exon 3
Coelacanth	vasotocin gene	42.5%	41.2%	48.1%
	mesotocin gene	40.0%	41.2%	56.3%
Bovine	vasopressin gene	87.5%	94.0%	93.3%
	oxytocin gene	90.0%	95.5%	89.5%
Human	vasopressin gene	92.5%	95.5%	98.2%
	oxytocin gene	90.0%	94.0%	88.9%

The GC3 contents of all three exons of the coelacanth vasotocin and mesotocin genes are compared with the GC3 content in bovine and human vasopressin and oxytocin genes to determine if the coelacanth genes have undergone gene conversion.