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.
PSD spectrum of species found in MALDI-TOF mass spectra of tears. (A) PSD spectrum of m/z 610 species found as a major component in both normal and dry eye tears. (B) PSD spectrum of m/z 638 species, found as a major component only in normal tears.
