The Department of Molecular Biosciences, The Wenner-Gren Institute (MBW) was officially launched on January 1, 2013, the result of merging the Department of Genetics, Microbiology and Toxicology, the Department of Molecular Biology and Functional Genomics, and the Wenner-Gren Institute for Experimental Biology.

MBW is housed in the Arrhenius Laboratories located at the northern end of the Frescati Campus of Stockholm University.

Together with neighboring biology and chemistry departments, MBW contributes to the strong tradition of academic excellence of the Natural Science Faculty at Stockholm University.

MBW unites more than 30 independent research groups and currently has a staff of around 170, of which 70 are Ph.D. students.