Loss of smell (olfaction) is a commonly reported symptom of COVID-19 infection. Recently, Bilinska, et al. set out to better understand the underlying mechanisms for loss of smell resulting from SARS-CoV-2 infection. In their research, they used in situ hybridization to investigate the expression of TMPRSS2, a SARS-CoV-2 viral entry protein in olfactory epithelium tissues of mice.

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