docs: def locus_features(self, locus):
          """
          Returns all features associated with a locus
  
          :param locus: string containing HLA locus.
          :type locus: ``str``
          :rtype: ``dict``
          """
          features = self.api.list_features(locus=locus)
          feat_dict = {":".join([a.locus, str(a.rank), a.term, a.sequence]): a.accession for a in features}
          return feat_dict