LAP3 and obstructive sleep apnea syndrome: For the differentially expressed proteins between severe OSA and moderate OSA groups, proteins were mainly enriched in “leukocyte mediated immunity,’ “cell activation,” “cell migration,” etc. under the category of biological process; were mainly enriched in “secretory granule,” “extracellular membrane-bounded organelle,” “extracellular exosome,” etc. under the category of cellular component; and were mainly enriched in “monosaccharide binding,” “peptidase regulator activity”, “cell adhesion molecule binding,” etc. under the category of molecular function.