Further purification was carried out on a CM-Sephadex-C-25 weak acid cation exchange resin (Pharmacia), and the bound fraction was eluted with 0.1 M NH 4 Cl.
Further purification was carried out on a CM-Sephadex-C-25 weak acid cation exchange resin (Pharmacia), and the bound fraction was eluted with 0.1 M NH 4 Cl.