Variant: rs11806180 

    present in Gene: CDC42BPA
    present in Chromosome: 1
    Position on Chromosome: 227315768
    Alleles of this Variant: A/C

rs11806180 in CDC42BPA gene and Hair Color PMID 30531825 2018 Genome-wide study of hair colour in UK Biobank explains most of the SNP heritability.