Curious about the design behind ncbi.nlm.nih.gov? SiteFontCheck scanned their live CSS architecture and identified 5 unique font families. The website relies heavily on <roboto, robotodraft, helvetica, arial, sans-serif> for its main text elements, paired with <arial, helvetica, sans-serif> and <roboto, helvetica neue, arial, tahoma> as fallback options, and 2 additional. Below is the precise map of font sizes, weights, and text elements used across their site.