Method: K20R sense: 5'-GGGCAACTAAGGGAAGCTCTA-3', anti-sense: 5'-TAGAGCTTCCCTTAGTTGCCC-3';
D25G sense: 5'-AGGAAGCTCTATTAGGTACAGGAGCAGATGA-3', anti-sense: 5'-TCATCTGCTCCTGTACCTAATAGAGCTTCCT;
T26S sense: 5'-GAAGCTCTATTAGATAGTGGAGCAGATGATACA-3'; anti-sense: 5'-TGTATCATCTGCTCCACTATCTAATAGAGCTTC-3';
I54V sense: 5'-GGAATTGGAGGTCTTATCAAAGTAAGA-3; anti-sense: 5'-TCTTACTTTGATAAGACCTCCAATTCC-3';
I54V sense: 5'-ATTGGAGGTTTTGTCAAAGTAAGACAG-3', anti-sense: 5'-CTGTCTTACTTTGACAAAACCTCCAAT-3';
L63P sense: 5'-GTAAGACAGTATGATCAGATACCCATAGAAATCTGTGGAC-3'; anti-sense: 5'-GTCCACAGATTTCTATGGGTATCTGATCATACTGTCTTAC-3';
V82A sense: 5'-GTAGGACCTACACCTGCCAACATAATTGGAAG-3'; anti-sense: CTTCCAATTATGTTGGCAGGTGTAGGTCCTAC-3';
L90M sense: 5'-TAATTGGAAGAAATCTGATGA