Promotion of spheroid assembly of adult rat hepatocytes by some factor(s) present in the initial 6-hour conditioned medium of the primary culture. - Sakaguchi,K.; Koide,N.; Asano,K.; Takabatake,H.; Matsushima,H.; Takenami,T.; Ono,R.; Sasaki,S.; Mori,M.; Koide,Y.; Tsuji,T. (Pathobiology, 1991)