The Centers for Disease Control and Prevention (CDC) is inviting applications for the Exploratory/Developmental Research (R21) grant under the World Trade Center (WTC) Health Program, aimed at improving treatment effectiveness and diagnostic practices for health conditions related to the September 11, 2001, terrorist attacks. This funding opportunity seeks innovative research projects that address uncertainties in diagnosis and treatment for WTC responders and survivors, with a particular focus on vulnerable populations, including women and minorities, to promote health equity. With an estimated total program funding of $4 million, the CDC anticipates awarding between 4 to 8 grants, each with a maximum request of $500,000 over two years. Interested applicants must submit a Letter of Intent by September 27, 2024, and full applications by October 29, 2024; for further inquiries, contact James Yiin, PhD, at JYiin@cdc.gov.