Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Comparison of tear spectra to biochemical standards, (a) proteins, (i) tear sample, (ii) human lactoferrin, (iii) human lysozyme, (b) metabolites, (i) tear sample, (ii) sodium bicarbonate, (iii) urea, and (c) lipids, (i) tear sample, (ii) cholesterol, (iii) palmitic acid [115].
