Cytotoxic Influence of Khat (Catha edulis (Vahl) Forssk. ex Endl) on Oral Fibroblasts, Squamous Carcinoma Cells, and Expression of α Smooth Muscle Actin. - Syed, Azeem Ul Yaqin; Ahmed, Muhammad A.; AlSagob, Eman I.; Al-Askar, Mansour; AlMubarak, Abdulrahman M.; Jouhar, Rizwan; Ahmed, Abdul R.; Mokeem, Sameer A.; Aldahiyan, Nada; Vohra, Fahim; Abduljabbar, Tariq; Varzakas, Theodoros (Applied Sciences (2076-3417), 2021)