Figure 3. In vitro determination of feather degrading activity and production of keratinase and protease. Keratinolytic activity of isolated PM₂ strain indicating feather degradation at defined pH and culture filtrate protein (A). Proteolytic activity of isolated PM₂ strain was also evaluated (B). SEM micrograph of degraded feather treated with isolated strain PM₂ (C) with references to their controls (D).