Endospore Staining Spores are resistant to heat and chemicals because of a tough outer covering made of the protein keratin. The keratin also resists.
Mayank A. Nanavaty, DO, MRCOphth, MRCS(Ed) David J. Spalton, FRCP, FRCS, FRCOphth James F. Boyce, PhD Thomas J. T. P. Van den berg, PhD St. Thomas’ Hospital,
