Before revision: Right: auxin transport from leaves to roots in Arabidopsis thaliana A hormone (from the Greek participle , "setting in motion") is a class of signaling molecules in multicellular organisms that are sent to distant organs by complex biological processes to regulate physiology and behavior.
After revision: or tissuesRight: auxin transport from leaves to roots in Arabidopsis thaliana A hormone (from the Greek participle , "setting in motion") is a class of signaling molecules in multicellular organisms that are sent to distant organs by complex biological processes to regulate physiology and behavior.