from human placenta; type 1 (source material tested for hepatitis B antigen, HIV-1 antibody and HIV-2 antibody)
found in most tissues and organs, plentiful in the dermis, tendon and bone; generally used as a thin layer on tissue-culture surfaces to enhance cell attachment and proliferation, but may be used as a gel if desired
tested and found negative for the presence of bacteria, fungi and mycoplasma
