Returns a 64 bit variant key based on CHROM, POS (0-base), REF, ALT. The variant should be already normalized (see NormalizeVariant or use NormalizedVariantkey).

Returns a 64 bit variant key based on CHROM, POS (0-base), REF, ALT. The variant should be already normalized (see NormalizeVariant or use NormalizedVariantkey).

VariantKey(chrom, pos, ref, alt)

Arguments

chrom	Chromosome. An identifier from the reference genome, no white-space or leading zeros permitted.
pos	Position. The reference position, with the first base having position 0.
ref	Reference allele. String containing a sequence of nucleotide letters.
alt	Alternate non-reference allele string.