3544251 Bi-PASA bidirectional PCR amplification of specific alleles 9 3544247 Bi-PASA Bidirectional PASA 2 3544248 Bi-PASA bi-directional PCR allele-specific amplification 1 3544250 Bi-PASA bi-directional specific alleles 1 3544249 Bi-PASA Bidirectional allele-specific PCR 1 3544246 Bi-PASA bidirectional polymerase chain reaction amplification of specific alleles 1