To encourage the development of new research activities in categorical program areas. (Support generally is restricted in level of support and in time). The grant is administratively linked to another project or projects. An RL2 award may only be disaggregated from a U54 application and organizations may not apply for an RL2, Linked Exploratory/Development Grant. The RL2 activity code is used in lieu of the R21 for those programs that offer linked awards.