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Al-Mihanya, Rawaq Haider and Ibrahim, Ihsan Raisan and Mayih, Hayder Saud (2026) Estimation of KLRK1 (NKG2D) and 4-1 BB Gene expression as a biomarker for prognosis and diagnosis of Severe COVID-19. American Journal of Biology and Natural Sciences, 3 (9). ISSN 2997-7185