| FACC | Fanconi anemia complementation group C; Fellow of the American College of Cardiologists |
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| FACD | Fanconi anemia complementation group D; Fellow of the American College of Dentists |
| GABHS | group A beta-hemolytic streptococcus |
| GAG | glycosaminoglycan; group-specific antigen gene |
| GAT | gelatin agglutination test; geriatric assessment team; Gerontological Apperception Test; group adjus... |
| ludlow group | <geology> A subdivision of the British Upper Silurian lying below the Old Red Sandstone; so named from the Ludlow, in Western England. Source: Websters Dictionary (01 Mar 1998) |
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| lutheran blood-group system | A complex blood group system having pairs of alternate antigens and amorphic genes, but also subject to a dominant independently segregating repressor. (12 Dec 1998) |