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Table 3 Hugo gene names and gene phylogeny in case of ABC proteins with tandem repeats. If the two ABCA halves had split in evolution and been observed at different genomic loci, the hypothetical gene name would probably have been adapted as HUGO gene name.

From: Simplifying gene trees for easier comprehension

  Stem Subfamily level Subsubfamily level Subsubsubfamily level
Example 1: ABCA1, first half, should be ABCA1A
Gene classification following gene phylogeny ABC A (first half) 1
HUGO gene name ABC A (not recognized) 1
Hypothetical gene name following gene phylogeny ABC A 1 A
Example 2: ABCA3, second half, should be ABCA2C
Gene classification following gene phylogeny ABC A (second half) 3
HUGO gene name ABC A (not recognized) 3
Hypothetical gene name following gene phylogeny ABC A 2 C