For those of you with the Alberts text...... Page 999, top paragraph: "Once the pre-RC has been assembled in G1, the replication origin is ready to fire . The activation of S-Cdk in late G1 pulls the trigger and initiates DNA replcation. The initiation of replication also requires the activity of a second protein kinase, which collaborates with S-Cdk to cause the phosphorylation of ORC." My question: Is there a name for this mystery kinase? I can't seem to find anything on it. Any help would be greatly appreciated. Thanks guys.