The Paul Ehrlich Institute (German: Paul-Ehrlich-Institut – Bundesinstitut für Impfstoffe und biomedizinische Arzneimittel, PEI) is a German federal agency, medical regulatory body and research institution for vaccines and biomedicines. It was founded in 1896 and is subordinate to the Federal Ministry of Health. The institute is a WHO Collaborating Centre for quality assurance of blood products and in vitro diagnostic devices. It is located in Langen, Hesse, near Frankfurt, and was located in Frankfurt for most of the 20th century. It is named for its founding director, the immunologist and Nobel Prize laureate Paul Ehrlich.