def most_recent_common_ancestor(self, *ts):
        """Find the MRCA of some tax_ids.

        Returns the MRCA of the specified tax_ids, or raises ``NoAncestor`` if
        no ancestor of the specified tax_ids could be found.
        """
        if len(ts) > 200:
            res = self._large_mrca(ts)
        else:
            res = self._small_mrca(ts)

        if res:
            (res,), = res
        else:
            raise NoAncestor()
        return res
Find the MRCA of some tax_ids.

        Returns the MRCA of the specified tax_ids, or raises ``NoAncestor`` if
        no ancestor of the specified tax_ids could be found.