“…The presence of insulin-like activity in growthhormone preparations has been reported (Park, Brown, Comblath, Daughaday & Krahl, 1952;Ottaway & Bulbrook, 1955), and partial separation of the activity from growth-hormone preparations, using ultrafiltration, was reported by Ottaway & Paul (1957). Separation and complete purification of a peptide with insulin-like properties has now been accomplished by electrophoretic techniques.…”