Collections Cell Biology Collection Browse our selection of continuous, hTERT-immortalized, primary and iPS cell lines as well as our selection of culture media and associated reagents. Microbiology Collections Choose from among the world’s largest collection of bacteria, viruses, yeast, fungi, protozoa, nucleic acids, and molecular tools. Preceptrol® Cultures ATCC's Preceptrol® cultures offer an economical way for your lab to use well-characterized ATCC strains. Most preceptrol cultures are packaged in convenient serum vials, and afforded the same standards of quality as our traditional batch vial preparations. Special Collection View items available from the US National Park Service.