def prodigal_gene_start(rec_description: str) -> int:
    """Get a gene start index from a Prodigal FASTA header

    Examples
    --------
    Given the following Prodigal FASTA output header, parse the gene start index (i.e. 197)
    >>> prodigal_gene_start("k141_2229_1 # 197 # 379 # 1 # ID=4_1;partial=00;start_type=ATG;rbs_motif=AGGAGG;rbs_spacer=5-10bp;gc_cont=0.437")
    197

    Parameters
    ----------
    rec_description : str
        SeqRecord description of Prodigal FASTA header

    Returns
    -------
    int
        Gene start index
    """
    return int(rec_description.split('#')[1].strip())