the precise dynamic property of glucagon secretion in response to glucose concentration has not yet been elucidated , since in in vitro studies using pancreatic islets , the co-existence of pancreatic b cells modifies the mode of glucagon secretion , and in vivo studies , the exogenous insulin administration greatly affects pancreatic a cell function .
C0022131
pancreatic islets
C0030280
pancreatic a cell