mergeRefGene: for merging hg19 refGene type of track (called genePredExt format) from UCSC genome browser to a file with a single composite gene model per gene for use in the UCSC Xena

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1. ./getRefGene_hg19.sh

2. python mergeRefGene.py refGene_hg19 refgene_good multiple_multipleIsland

3. Load refgene_good and refgene_good.json to Xena server