Geranium and lemon essential oils and their active compounds downregulate angiotensin-converting enzyme 2 (ACE2), a SARS-CoV-2 spike receptor-binding domain, in epithelial cells - Kumar, K JS; Vani, M G; Wang, C S; Chen, C C; Chen, Y C; Lu, L P; Huang, C H; Lai, C S; Wang, S Y (Plants, 2020)