Phylogenetic relationship of Clock nucleotide sequences obtained from Arctic charr (Sal), Atlantic salmon (Ssa), medaka (Ola), rainbow trout (Omy), and zebrafish (Dre) coding regions. A) Neighbour-Joining. B) Maximum Parsimony. The tree was rooted to the OlaClock sequence. Values indicated at the nodes are the percent bootstrap values of 1000 replicates.