title: [A procedure for determining the proteolytic activity of biological substrates at various pH values].
abstract: The proteolytic activity of biosubstrates and biological fluids at different pH values was determined in the third trimester of pregnancy and at labor. The nature of their proteolytic activity was specified for each biological fluid and it can be associated with pepsin or other proteases.
authors.forename: E V
authors.initials: EV
authors.lastname: Kolodkina
authors.forename: N F
authors.initials: NF
authors.lastname: Kamakin