Returns a 64 bit variant key based on pre-encoded CHROM, POS (0-base) and REF+ALT.

Returns a 64 bit variant key based on pre-encoded CHROM, POS (0-base) and REF+ALT.

EncodeVariantKey(chrom, pos, refalt)

Arguments

chrom	Encoded Chromosome (see EncodeChrom)
pos	Position. The reference position, with the first base having position 0.
refalt	Encoded Reference + Alternate (see EncodeRefAlt)