Soyasaponin‑I Attenuates Melanogenesis through Activation of ERK and Suppression of PKA/CREB Signaling Pathways - Prasertsri Ma-In; Karuntarat Teeravirote; Panupong Mahalapbutr; Orasa Panawan; Sukanya Luang; Atit Silsirivanit (ACS Omega)