5.4.99.50 A48V naturally occuring mutation, single nucleotide exchange 748722 5.4.99.50 E309K naturally occuring mutation, single nucleotide exchange 748722 5.4.99.50 I768K naturally occuring mutation, single nucleotide exchange 748722 5.4.99.50 additional information presence of single nucleotide polymorphisms with four non-synonymous mutations outside the active site of isozyme MiFRS 748722 5.4.99.50 P39S naturally occuring mutation, single nucleotide exchange 748722