00305nam a2200097Ia 4500008004100000082004200041100002300083245005300106260004000159300000800199140113s9999    xx            000 0 und d  a"576.35""1972"".25/27""(082.2)    L3"  a"Balls, & Billett"  aThe Cell Cycle in develoopment & differentiation  a1973bCambridge Univ. PresscLondon  a483