Specific antisera produced by direct immunization with slices of polyacrylamide gel containing small amounts of protein.

Rabbits were injected with slices of polyacrylamide gels containing entrapped insect proteins after separation by electrophoresis. Specific antibodies were produced independently of the nature of the gel (with or without sodium dodecyl sulphate) and of the staining technique (amido black or Coomassie Blue). The procedure appears to be a rapid and simple method for production of antibodies specific to proteins separated in minute quantities from a complex mixture.