Newcomer Supply Fungus, PAS, Aspergillus sp., Artificial Control Slides are for the positive histochemical staining of Aspergillus sp. in tissue sections. Aspergillus fumigatus purchased from Remel Microbiology Products is used to produce the positive control tissue. Fungus, PAS, Aspergillus sp., Artificial Control Slides contain sections of positive staining rat lung and negative staining human lung.