Abstract
Rabbit skeletal muscle actin labeled with 125 iodine by an enzymic method is shown to be capable of polymerization and to bind to matrix‐bound pancreatic DNAse I like unlabeled G‐actin. It was used to demonstrate that actin can be released from DNAse‐I–agarose by 35–40% formamide. Actin which was only shortly exposed to this solvent was able to bind again to DNAse I and to form filaments indicating that it has been recovered functionally intact from the affinity matrix.