A. Abood, S.; ساجدة; H. Khathyer, F.; فراس. Measurement of Specific Activity of Dihydrofolate Reductase (DHFR) Enzyme and Determination of Folate Content Extracted from UV-Exposed Stem- Derived Callus of Sunflower (Helianthus Annuus L.). RSCI 2025, 23, 1-11.