To support a discrete, specified, circumscribed project that is administratively linked to another project or projects, and to be performed by the named investigator(s) in an area representing his or her specific interest and competencies. An RL1 award may only be disaggregated from U54 application and organizations may not apply for an RL1, Linked Research Project Grant. The RL1 activity code is used in Lieu of the R01 for those programs that offer linked awards.