def METHOD_NAME(self):
    """Returns selection string that selects atoms in this chain."""
    segment = self.getSegment()
    if segment is None:
        if self._selstr:
            return 'chain {0} and ({1})'.format(self.getChid(),
                                                self._selstr)
        else:
            return 'chain {0}'.format(self.getChid())
    else:
        return 'chain {0} and ({1})'.format(self.getChid(),
                                            segment.METHOD_NAME())