Letters in lower case have no entries. Acronyms not appearing in the glossary, may be included in the List of Acronyms at the end of the glossary. Sarcoma A type of cancer that starts in the bone or muscle. Screening Looking for evidence of a particular disease such as cancer in persons with no symptoms of disease. Checking for disease when there are no symptoms.
Sequence See base sequence.
DNA sequence that has a single occurrence in the human genome and whose location and base sequence are known. Detectable by polymerase chain reaction, STSs are useful for localizing and orienting the mapping and sequence data reported from many different laboratories and serve as landmarks on the developing physical map of the human genome. The chromosomes that determine the sex of an organism. Cloning of DNA fragments randomly generated from a genome. See library, genomic library.