These reagents can be used to detect FastTag®-, 3’ or 5’ EndTag™-labeled probes in applications such as in situ hybridization or Southern and northern blotting. All antibodies have been affinity-purified. The fluorescein label can be directly detected (depending on target concentrations) or amplified with this affinity purified antibody reagent. Labeled probes can be used in applications such as in situ hybridization and blotting.