Evolutionary conservation of the amino acid residues (
a
) p.189, (
b
) p.218, (
c
) p.446, and (
d
) p.683 in PHEX. The novel
PHEX
mutations Q189Hfs*22, H218Sfs*2, F446*, and L683H occur at highly conserved positions in PHEX protein as shown by comparing the corresponding amino acid sequences of nine different species.