Desain Primer, Isolasi, dan Amplifikasi Gen blue laccase (POXA1b) dari Jamur Tiram Putih (Pleurotus ostreatus (Jacq.) P. Kummer, 1871) = Primer Design, Isolation, and Amplification of the blue laccase (POXA1b) Gene from White Oyster Mushroom (Pleurotus ostreatus (Jacq.) P. Kummer, 1871)