Fig 4.

Phylogenetic relationship of LWS genes. The dendrogram was constructed by using the neighbor-joining method (21) on Kimura two-parameter distances (29) of exon 2–5 nucleotide sequences. Bootstrap values obtained in 500 replications are given on the branches. The two ancient allelic lineages (I and II) are indicated on the branches. The geographical origin of the samples is indicated. The alleles found in Lake Victoria are specified by numbers. The Lake Malawi sequences were from Aulonocara usisia, Labeotropheus trewavasae, M. parallelus, Protomelas fenestratus, P. daktari, and Taeniolethrinops nyassae.