def to_ucsc_string(triplet):
    """
    Convert a triplet to a UCSC string.

    Parameters
    ----------
    triplet : (chrom, start, end)

    Returns
    -------
    ucsc_string : str
        UCSC-style string, 'chrom:start-end'
    """
    return "{0}:{1}-{2}".format(*triplet)