Sarcoma, metastatic
A sarcoma that is spreading into other body tissues through the lymphatic system. The most common site for metastatic sarcoma is the lungs, and there are usually multiple lesions (seen as spots on an X-ray, or as masses on a CT scan). Treatment is by chemotherapy and surgery, but prognosis is poor.
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- Sarcoma, synovial
A malignant tumor of soft tissue that arises near, but not in, a joint. Synovial sarcomas most often occur in adolescents or young adults, are typically slow-growing, and may escape notice until they become painful. They occur mainly in the arms and legs, near large joints, especially the knees. Although the tumor is called synovial […]
- SARS vaccine
A vaccine to protect against severe acute respiratory syndrome (SARS). The SARS epidemic surfaced early in 2003 and a crash program was soon begun to develop a vaccine directed against the coronavirus that causes SARS. No licensed vaccine had hitherto been developed for any human coronavirus. Other coronaviruses are among the viruses that cause the […]
- Sartorius muscle
The long band of muscle that stretches from the calf to the pelvis. It moves the thigh and, by extension, the leg.
- Satellite DNA
DNA that contains many tandem (not inverted) repeats of a short basic repeating unit. Satellite DNA is located at very specific spots in the genome (on chromosomes 1, 9, 16 and the Y chromosome, the tiny short arms of chromosomes 13-15 and 21 and 22, and near the centromeres of chromosomes).
- Saturated fat
A fat that contains only saturated fatty acids, is solid at room temperature, and comes chiefly from animal food products. Some examples of saturated fat are butter, lard, meat fat, solid shortening, palm oil, and coconut oil. Saturated fat tends to raise the level of cholesterol in the blood.