In vitro evaluation of free flavonoids in Cassia fistula Linn. calli of different ages under varying concentrations of plant growth regulators (PGRs). Indian Journal of Experimental Biology (IJEB), [S. l.], v. 60, n. 08, p. 635–639, 2022. DOI: 10.56042/ijeb.v60i08.64965. Disponível em: https://or.niscpr.res.in/index.php/IJEB/article/view/1607. Acesso em: 26 may. 2026.