“By the time of award, the individual must be a citizen or a non-citizen national of the United States or have been lawfully admitted for permanent residence (i.e., possess a currently valid Permanent Resident Card USCIS Form I-551, or other legal verification of such status).”
Some of the other F-31 awards may have different eligibility standards.
Here is a link to the list of them- http://grants.nih.gov/training/F_files_nrsa.htm
they are on the table at the bottom of the page.
Click on the active link and then search in the PA for the word eligibility.