J Exp Med. 1940 Nov 30;72(6):663-7. doi: 10.1084/jem.72.6.663.
The Journal of experimental medicine
E Witebsky, N C Klendshoj
PMID: 19871051 PMCID: PMC2135043 DOI: 10.1084/jem.72.6.663
The isolation of group specific B substance from human stomach juice is described. The substance is carbohydrate-like in nature and is as potent as the carbohydrate-like substance group A isolated from commercial pepsin and peptone respectively.