def get_blocks(self, chrom, start, end):
if chrom not in self.block_trees:<EOL><INDENT>return []<EOL><DEDENT>return self.block_trees[chrom].intersectingInterval(start, end)<EOL>
Get any blocks in this alignment that overlap the given location.

:return: the alignment blocks that overlap a given genomic interval;
         potentially none, in which case the empty list is returned.