<https://biotium.com/product/cf-dye-dextran-40000-mw-anionic-and-fixable/#product>
<http://schema.org/description>
"This dextran is 40,000 MW, and contains a formaldehyde-fixable free-amine group; available with a selection of CF® dyes."
<https://biotium.com/product/cf-dye-dextran-40000-mw-anionic-and-fixable/?attribute_pa_conjugation=cf488a>