 Neuroglobin is a monomer that reversibly binds oxygen with an affinity higher than that of hemoglobin.It also increases oxygen availability to brain tissue and provides protection under hypoxic or ischemic conditions, potentially limiting brain damage.Neuroglobin were in the past found only in vertebrate neurons, but recently in 2013, were found in the neurons of unrelated protostomes, like photosynthesis acoel as well as radiata such as jelly fish.