; (3) professional development programs to increase the numbers and the high-quality preparation of STEM faculty at HBCUs, TCUs, and MSIs, including programs to encourage STEM doctoral students to teach at HBCUs, TCUs, and MSIs; and (4) mechanisms for institutions of higher education that are not HBCUs, TCUs, or MSIs to partner with HBCUs, TCUs, and MSIs on STEM education, including the facilitation of student transfer, mentoring programs for students and junior faculty, joint research projects, and student access to graduate education. (d) Research experiences Grants under this section may fund the development or expansion of opportunities for the exchange of students and faculty to conduct research, including through partnerships with institutions of higher education that are not HBCUs, TCUs, or MSIs, private sector and non-profit organizations, Federal laboratories, and international research institutions. (e) Partnerships In awarding grants under this section, the Director of the National Science Foundation shall— (1) encourage HBCUs, TCUs, and MSIs and consortia thereof and partnerships with one or more HBCU, TCU, or MSI, to submit proposals; (2) require proposals submitted in partnership with one or more HBCU, TCU, or MSI include a plan for establishing a sustained partnership that is jointly developed and managed, draws from the capacities of each institution, and is mutually beneficial