Footnotes

a Lipofectamine is a line of transfection reagents manufactured by Life Technologies, Grand Island, N.Y., USA.
b ExGen 500 is a product manufactured by Thermo Fisher Scientific, Waltham, Ma., USA.
c Aquaphor is a product manufactured by Beiersdorf, Hamburg, Germany.
d Britena Whitening & Anti-blotch Cream is a product manufactured by Genecon Biotech, a subsidiary of Biomics Biotechnologies Co., Ltd., Nantong, China.