def make_orth(db, genes1, genes2):
    """
    Returns gene names as a tuple of two sorted lists (by start pos)

    The ortholog format is ((gene1a, gene1b, gene1c), (gene2a, gene2b))
    """
    
    genes1 = list(genes1)
    genes2 = list(genes2)
    genes1.sort(key=lambda x: db.get_region(x).start)
    genes2.sort(key=lambda x: db.get_region(x).start)
    return (genes1, genes2)