Most drug discovery companies have their own assay development department. It has begun very common to outsource these activities in order to focus on some important projects. in some cases they also want to get access to some specific assay technologies. Assay development outsourcing can also be very effective to save money and time.

AnaSpec		Biological Stain/Bioconjugate Synthesis, Assay Design and Development
Innovabiosciences		Accelerate assay development:: identification of identify a suitable binding reagent for FP assays
iNovacia		General assay development services, skilled for tough targets and metabolic enzymes
Evotec
Axxam