Causes of the Production of Multiple Forms of beta-Galactosidase by Bacillus circulans BIOSCIENCE BIOTECHNOLOGY AND BIOCHEMISTRY,75(2):268-278 2011(Feb.) Author:Song, Jingyuan; Abe, Kiriko; Imanaka, Hiroyuki; Imamura, Koreyoshi; Minoda, Masashi; Yamaguchi, Shotaro; Nakanishi, Kazuhiro;