def set_euk_hmm(self, args):
        'Set the hmm used by graftM to cross check for euks.'
        if hasattr(args, 'euk_hmm_file'):
            pass
        elif not hasattr(args, 'euk_hmm_file'):
            # set to path based on the location of bin/graftM, which has
            # a more stable relative path to the HMM when installed through
            # pip.
            setattr(args, 'euk_hmm_file', os.path.join(os.path.dirname(inspect.stack()[-1][1]),'..','share', '18S.hmm'))
        else:
            raise Exception('Programming Error: setting the euk HMM')
Set the hmm used by graftM to cross check for euks.