A GLYCOPROTEIN which can inhibit the activity of tobacco mosaic, tomato bushy stunt and other plant viruses has been isolated by B. Kassanis and A.kleczkavski (J Gen. Microbiol, 2, No. 2 ; May 1948). It was obtained from the sap of Phytolacca esculenta by differential precipitation with ethanol followed by adsorption on 'Celite' and elution with 10 per cent sodium chloride. The protein is unaffected by pepsin and trypsin unless it is denatured, and it is not effective against bacteriophage.
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