sentence: The predicted small ORF encoding the α - pheromone ( designated PB α ) overlaps with the annotated hypothetical genes PAAG_00855 , PABG_01384 and PADG_03979 of Pb01 , Pb03 and Pb18 respectively , and for Pb01 the PB α gene is located on the opposite DNA strand of PAAG_00855 .