The most diverse collection of microorganisms, stem cell lines and animal and human cell lines.
http://www.atcc.org

Sigma is the world leader in biochemicals, including antibiotics, buffers, carbohydrates, enzymes, forensic tools, hematology and histology, nucleotides, proteins, peptides, amino acids and their derivatives, used in basic life science research.
http://www.sigmaaldrich.com

Supplier of research tools for molecular biology, cell biology and drug screening.
http://www.cambrex.com

Provides innovative products to the scientific community including antimicrobial reagents, selective antibiotics, selection media and cloning vectors etc.
http://www.invivogen.com

Acquired by Sigma-Aldrich in 2005, the largest supplier of cell culture products including sera, media, supplements and bioproduction consumables.
http://www.sigmaaldrich.com/SAFC

Spectrum is a leader in providing disposable hollow fiber modules that are used primarily for biological separations, molecular separations and the management of cell lines.
http://www.spectrapor.com