In a known method of immunodiffusion, a sample containing a first agent such as an antigen is introduced into a well in a lamina of agarose gel containing a second agent such as a complementary antibody. The first agent diffuses through the gel and becomes releasably bound to the second agent and, when...http://www.google.es/patents/US5429951?utm_source=gb-gplus-sharePatente US5429951 - Radial immunodiffusion and like techniques
