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  Indian J Med Microbiol
 

Figure 4: (a) Section of old tissue block demonstrating keratin after staining with Mallory stain (×20); (b) section of long-term fixed tissue unable to demonstrate keratin after staining with Mallory stain (×20)

Figure 4: (a) Section of old tissue block demonstrating keratin after staining with Mallory stain (×20); (b) section of long-term fixed tissue unable to demonstrate keratin after staining with Mallory stain (×20)