part of part of has part has part has_part characteristic of has modifier abnormal circulating glucagon level decreased circulating glucagon level reduction in the blood concentration of the peptide hormone secreted by the alpha cells of the pancreas that normally plays an important role in regulation of blood glucose concentration, ketone metabolism, and several other biochemical and physiological processes MPheno.ontology MP:0002696 decreased plasma glucagon levels reduced circulating glucagon level decreased circulating hormone level abnormal decreased amount pro-glucagon blood