cell communication cellular response to stimulus cell communication cellular response to stimulus cell communication cellular response to stimulus cell communication cellular response to stimulus cell communication cellular response to stimulus cell communication cellular response to stimulus cell communication cellular response to stimulus cell communication cellular response to stimulus cell communication cellular response to stimulus cell communication cellular response to stimulus cell communicationcell communication cellular response to stimuluscellular response to stimulus signaling receptor activity drug binding ion binding neurotransmitter binding amine binding organic cyclic compound binding heterocyclic compound binding signaling receptor activity drug binding ion binding neurotransmitter binding amine binding organic cyclic compound binding heterocyclic compound binding signaling receptor activity drug binding ion binding neurotransmitter binding amine binding organic cyclic compound binding heterocyclic compound binding signaling receptor activity drug binding ion binding neurotransmitter binding amine binding organic cyclic compound binding heterocyclic compound binding signaling receptor activity drug binding ion binding neurotransmitter binding amine binding organic cyclic compound binding heterocyclic compound binding signaling receptor activity drug binding ion binding neurotransmitter binding amine binding organic cyclic compound binding heterocyclic compound binding signaling receptor activity drug binding ion binding neurotransmitter binding amine binding organic cyclic compound binding heterocyclic compound binding signaling receptor activity drug binding ion binding neurotransmitter binding amine binding organic cyclic compound binding heterocyclic compound binding signaling receptor activity drug binding ion binding neurotransmitter binding amine binding organic cyclic compound binding heterocyclic compound binding signaling receptor activity drug binding ion binding neurotransmitter binding amine binding organic cyclic compound binding heterocyclic compound binding signaling receptor asignaling receptor activity drug bindingdrug binding ion bindingion binding neurotransmitter binneurotransmitter binding amine bindingamine binding organic cyclic compoorganic cyclic compound binding heterocyclic compounheterocyclic compound binding cell membrane cell membrane cell membrane cell membrane cell membrane cell membrane cell membrane cell membrane cell membrane cell membrane cellcell membranemembrane 
