| FRS | Fellow of the Royal Society; ferredoxin-reducing substance; first rank symptom; furosemide |
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| GSS | gamete-shedding substance; General Social Survey; Gerstmann-Straussler-Scheinker [disease] |
| IAS | immunosuppressive acidic substance; infant apnea syndrome; insulin autoimmune syndrome; interatrial ... |
| IFGS | interstitial fluid and ground substance |
| I-sub | inhibitor substance |
| filar substance | A filamentous plasmatic material, beaded with granules, demonstrable by means of vital staining in the immature red blood cells. Synonym: alpha substance, filar mass, filar substance, substantia reticularis, substantia reticulofilamentosa. Synonym: reticular formation. (05 Mar 2000) |
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