has_part part_of three_prime_UTR polyA_site biological_region polyA_site_cluster david 2020-05-27T14:17:30Z polyA_cluster A region defined by a cluster of experimentally determined polyadenylation sites, typically less than 25 bp in length and associated with a single polyadenylation signal. polyA site cluster sequence Added as per GitHub Issue Request #450 (https://github.com/The-Sequence-Ontology/SO-Ontologies/issues/450) polyA cluster SO:0002259