| National Center for Agricultural Law Research and Information | National Center for Agricultural Research and Extension | National Center for Agricultural Research and Technology Transfer | National Center for Agricultural Utilization Research | National Center for AIDS and STD Control |
| National Center for Air and Space Law | National Center for Airborne Laser Mapping | National Center for Aircraft Technical Training | National Center for Alcohol Law Enforcement | National Center for Alternative Certification |
| National Center for American Indian Economic Development | National Center for American Indian Enterprise Development | National Center for Animal Health Programs | National Center for Animal Health Surveillance | National Center for Animal Law |
| National Center for Applied Technology | National Center for Appropriate Technology | National Center for Asphalt Technology | National Center for Assisted Living | National Center for Atmospheric Research |
| National Center for Atmospheric Research/Research Applications Program | National Center for Automated Information Research | National Center for Automated Information Retrieval | National Center for Behavioral Genomics | National Center for Bicycling and Walking |
| National Center for Biodefense | National Center for Biodefense and Infectious Diseases | National Center for Biomedical Ontology | National Center for Biomedical Research and Training | National Center for Biotechnology Information |
| National Center for Black Philanthropy, Inc. | National Center for Blind Youth in Science | National Center for Boundless Playgrounds | National Center for Business and Economic Research | National Center for Case Study Teaching in Science |
| National Center for Catholic Youth Sports | National Center for Charitable Statistics | National Center for Child Abuse Prevention | National Center for Child Health and Development | National Center for Children and Families |
| National Center for Children Exposed to Violence | National Center for Children, Families and Communities | National Center for Children in Poverty | National Center for Children's Illustrated Literature | National Center for Child Safety and Awareness |
| National Center for Child Traumatic Stress | National Center for Chronic Disease Prevention and Control | National Center for Chronic Disease Prevention and Health | National Center for Chronic Disease Prevention and Health Promotion | National Center for Communicable Diseases |
| National Center for Communications of the Civil Protection Agency | National Center for Community Education | National Center for Community Rehabilitation | National Center for Competence in Research | National Center for Competency Testing |
| National Center for Complementary and Alternative Medicine | National Center for Computational Hydroscience and Engineering | National Center for Computational Sciences | National Center for Computer Crime Data | National Center for Conflict Resolution Education |
| National Center for Conservation, Restoration and Museumology | National Center for Constitutional Studies | National Center for Construction Education and Research | National Center for Construction Laboratories and Research | National Center for Contemporary Arts |
| National Center for Cool and Cold Water Aquaculture | National Center for Coral Reef Research | National Center for Creative Aging | National Center for Crisis and Continuity Coordination | National Center for Critical Information Processing and Storage |
| National Center for Cultural Healing | Multiple Reporting Record | Multiple Representation Environment | Multiple Requester Terminal | Multiple Requests Terminal |
| Multiple-Resolution Bitmap | Multiple Resolution Bitmap | Multiple Resolution Bitmap Compiler | Multiple Resource Host Architecture | Multiple Resource Management Area |
| Multiple Respiratory Gas Monitoring | Multiple Response Surface | Multiple Risk Factor Intervention Trial | Multiple Risk Factors | Multiple Risk Factor Syndrome |
| Multiple Rocket Launcher | Multiple Round, Ascending Bid | Multiple Round Simultaneous Impact | Multiple Routing Configuration | Multiple Sail |
| Multiple Satellite Deployment System | Multiple Saturation-Recovery Multiple-Echo | Multiple-Scale Integrated Assessment of Societal Metabolism | Multiple Scan Chain Partitioning | Multiple Scattered Wave-Self Consistent Field-X |
| Multiple Scatterer Algorithm | Multiple Scattering Relativistic Correlated | Multiple Scattering Theory | Multiple Sclerose Vereniging Nederland | Multiple Sclerosis |
| multiple sclerosis | Multiple Sclerosis and Related Diseases | Multiple Sclerosis-Associated Retrovirus | Multiple Sclerosis Association | Multiple Sclerosis Association of America |
| Multiple Sclerosis Centers of Excellence | Multiple Sclerosis Certified Nurse | Multiple Sclerosis Certified Specialist | Multiple Sclerosis Collaborative Research Group | Multiple Sclerosis Education Network |
| Multiple Sclerosis Foundation | Multiple Sclerosis Genetic Group | Multiple Sclerosis Impact Scale | Multiple Sclerosis International Federation | Multiple Sclerosis Intimacy and Sexuality Questionnaire |
| Multiple Sclerosis Nurses International Certification Board | Multiple Sclerosis Patient Network | Multiple Sclerosis Quality of Life | Multiple Sclerosis Quality of Life Inventory | Multiple Sclerosis Quarterly Report |
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