"For example, the reagent is an immunoreagent that includes an enzyme such as horseradish peroxidase that is activated by exposing the biological sample to diamino benzene (DAB); alkaline phosphatase that is activated by 2-5???-chloro-2-phosphoryloxyphenyl)-6-chloro-4(3H)-quinazolinone, NABP/new fuchsin, or NBT/BCIP; or beta-galactosidase that is activated by exposure to BCIG. Activation of the enz" . . . .