The nature and the number of proteins reflect differences in cell subpopulations/subsets or cell cycle/differentiation stages, thereby influencing viral replication and pathogenesis, as well as defining the cell susceptibility and permissiveness to viral infection. Empowered by unrivaled expertise and advances in single-cell approaches, Creative Biolabs provides a comprehensive suite of single-cell protein screening services to promote SARS-CoV-2 (COVID-19) research.