India Institute of Science Education and Research, Pune 1 article published in JoVE Biology Measuring Glutathione-induced Feeding Response in Hydra Ram Kulkarni1, Sanjeev Galande1 1Centre of Excellence in Epigenetics, India Institute of Science Education and Research, Pune Here we describe a simple assay for the quantification of the feeding response in hydra induced by the reduced form of glutathione. This assay relies on measuring the distance between the apical end of the tentacle and mouth of hydra.