HistoTox Labs HistoTox Labs is a GLP compliant contract histology laboratory located at the foot of the Rocky Mountains in Boulder, Colorado. Our histology and immunohistochemistry lab have developed the ability to provide the highest quality bone and soft tissue sections quickly, in order to meet the diverse and constantly changing needs of our customers. Whether we are supporting pharmaceutical, biotech or contract research organizations (CROs), our commitment to outstanding customer service, high quality sections, competitive pricing and quick turnaround times make HistoTox Labs the ideal source for reliable histology lab services.