To support comprehensive interdisciplinary research training programs at the undergraduate, pre-doctoral and/or postdoctoral levels, by capitalizing on the infrastructure of existing multidisciplinary and interdisciplinary research programs. The RL9 is for trainees who do not meet the qualifications for NRSA authority. The training program is administratively linked to another project or projects. An RL9 award may only be disaggregated from a U54 application and organizations may not apply for an RL9, Linked Research Training Award. The RL9 is used in lieu of the R90 for those programs that offer linked awards.