rev strand
c .. CDS
u .. UTR
. .. outside the transcript

32388      32399
89012345678901234
ccccccccccccuuuuu....
GTCCGTCGGCATAAACTT-----------------TCCGTCGGCATAAACTTTCCGTCCGCGCGCCACAGCCGGAAC       ref
GTCCGTCGGCATAAACTTTCCGTCGGCATAAACTT                                                 alt

G-----------------TCCGTCGGCATAAACTTTCCGTCGGCATAAACTTTCCGTCCGCGCGCCACAGCCGGAAC       ref
GTCCGTCGGCATAAACTTTCCGTCGGCATAAACTT                                                 alt