In communications, Circuit Switched Data (CSD) is the original form of data transmission developed for the time-division multiple access (TDMA)-based mobile phone systems like Global System for Mobile Communications (GSM).
These results imply that stronger purifying selection is operating at the fem gene in the presence of csd.
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Previous studies showed that fem retained its sex determination function, whereas the rise of csd established a new primary signal of sex determination.
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Methods: A national CSD surveillance study is conducted in Israel since 1991.
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Results: There were 846 immunocompetent patients with CSD included in this study.
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CSD: She's a joy to behold and the funniest woman I know.