system process cell communication cellular response to stimulus regulation of biological quality regulation of molecular function system process cell communication cellular response to stimulus regulation of biological quality regulation of molecular function system process cell communication cellular response to stimulus regulation of biological quality regulation of molecular function system process cell communication cellular response to stimulus regulation of biological quality regulation of molecular function system process cell communication cellular response to stimulus regulation of biological quality regulation of molecular function system process cell communication cellular response to stimulus regulation of biological quality regulation of molecular function system process cell communication cellular response to stimulus regulation of biological quality regulation of molecular function system process cell communication cellular response to stimulus regulation of biological quality regulation of molecular function system process cell communication cellular response to stimulus regulation of biological quality regulation of molecular function system process cell communication cellular response to stimulus regulation of biological quality regulation of molecular function system processsystem process cell communicationcell communication cellular response to stimulucellular response to stimulus regulation of biological quaregulation of biological quality regulation of molecular funcregulation of molecular function protein binding receptor regulator activity protein binding receptor regulator activity protein binding receptor regulator activity protein binding receptor regulator activity protein binding receptor regulator activity protein binding receptor regulator activity protein binding receptor regulator activity protein binding receptor regulator activity protein binding receptor regulator activity protein binding receptor regulator activity protein bindingprotein binding receptor regulator activityreceptor regulator activity extracellular region extracellular region extracellular region extracellular region extracellular region extracellular region extracellular region extracellular region extracellular region extracellular region extracellular regionextracellular region