def read_targets(tarfile):
    """
    Return a tuple of targets
    Arguments:
    - `tarfile`: A tab-del file with EcoCyc names of sRNA and target
    """
    if not tarfile:
        return None
    tars = []
    try:
        for line in open(tarfile):
            tars.append(tuple(line.strip().split()[:2]))
    except IOError:
        return None
    return tars