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[Measurement of the level of nerve growth factor in murine blood serum].

Different values of nerve growth factor (NGF) concentrations, estimated in mice blood, were obtained as a result of the following reasons: 1) use of various procedures for estimation, 2) interaction of beta-NGF with high molecular blood serum proteins and 3) presence of a variety of the nerve growth proteins in mice blood: from complex to subunit forms of the protein including intermediate associations.