http://waxmanlabvm.bu.edu/~gsteinha/GTF_files/exon_no_UTR.bed.gz
http://waxmanlabvm.bu.edu/~gsteinha/GTF_files/both_prime_UTR.bed.gz
http://waxmanlabvm.bu.edu/~gsteinha/GTF_files/3_prime_UTR.bed.gz
http://waxmanlabvm.bu.edu/~gsteinha/GTF_files/5_prime_UTR.bed.gz