Gaɓa, Gaɓoɓi wani tarin tissues ne wadanda ke yin ayyuka iri daya. Rayuwa ta dabbobi da shuka sun dogara ne akan gaɓoɓi da dama dake nan a organ systems. Widmaier EP; Raff H; Strang KT (2014). Vander's Human Physiology (12th ed.). ISBN 978-0-07-128366-3.