These other molecules can be proteins or they can be lipids or they can be secondary menstrual molecules such as the calcium ions. And these interactions basically stimulate and pass down the information needed to ultimately stimulate the cellular processes that lead to some particular type of physiological effect. So in the case of this pathway, physiological effect might be running away in the case of this pathway. So we might regulate the blood pressure in this pathway, we actually want to uptake that glucose and transform the glucose into Glycogen. In this pathway, we actually want to repair certain types of damages to the Epidermal cells or the Epithelial cells. Now, many of these pathways have different types of interactions.