def generate_antisense_sequence(sequence):
    """Creates the antisense sequence of a DNA strand."""
    dna_antisense = {
        'A': 'T',
        'T': 'A',
        'C': 'G',
        'G': 'C'
    }
    antisense = [dna_antisense[x] for x in sequence[::-1]]
    return ''.join(antisense)