“…The explanation for these unusual results almost certainly lies in the choice ofthe rat as a model. Recent studies have indicated that in the rat betamethasone 17-valerate acts as an anti-cortlcostcroid (Young, Yoxall & Wagner, 1978;Young, Wagner & Fisk, 1978). Thus, in a dermal atrophy assay, an anti-inflammatory assay and in vitro lymphocyte transformation assay betamethasone 17-valcrate was less active than hydrocortisone.…”