organic cyclic compound binding heterocyclic compound binding signaling receptor activity organic cyclic compound binding heterocyclic compound binding signaling receptor activity organic cyclic compound binding heterocyclic compound binding signaling receptor activity organic cyclic compound binding heterocyclic compound binding signaling receptor activity organic cyclic compound binding heterocyclic compound binding signaling receptor activity organic cyclic compound binding heterocyclic compound binding signaling receptor activity organic cyclic compound binding heterocyclic compound binding signaling receptor activity organic cyclic compound binding heterocyclic compound binding signaling receptor activity organic cyclic compound binding heterocyclic compound binding signaling receptor activity organic cyclic compound binding heterocyclic compound binding signaling receptor activity organic cyclic compound bindingorganic cyclic compound binding heterocyclic compound bindingheterocyclic compound binding signaling receptor activitysignaling receptor activity cell organelle membrane-enclosed lumen membrane cell organelle membrane-enclosed lumen membrane cell organelle membrane-enclosed lumen membrane cell organelle membrane-enclosed lumen membrane cell organelle membrane-enclosed lumen membrane cell organelle membrane-enclosed lumen membrane cell organelle membrane-enclosed lumen membrane cell organelle membrane-enclosed lumen membrane cell organelle membrane-enclosed lumen membrane cell organelle membrane-enclosed lumen membrane cellcell organelleorganelle membrane-enclosed lumenmembrane-enclosed lumen membranemembrane 
