Assessment of theobromine-induced cytotoxicity in bladder cancer cell lines: Determination of IC50 values step-by-step using RStudio. - ERCAN, Elif; TERZİ, Emine; SANCI, Tuba ÖZDEMİR; BEDİR, Beyza Ecem ÖZ (Turkish Bulletin of Hygiene & Experimental Biology / Türk Hijyen ve Deneysel Biyoloji, 2026)