Al-Shamahy, H.A. et al. 2023. Tumor necrosis alpha (tnf-α) levels in the human gingival sulcus: rates and factors affecting its levels in healthy subjects. Sana’a University Journal of Medicine and Health Sciences. 17, 1 (Oct. 2023). DOI:https://doi.org/10.59628/jchm.v17i1.210.