Fig. 1.

Relative quantification of SARS-CoV-2 entry genes in human neural cell lines: ace2 and tmprss2 (a); ctsb and ctsl (b). Ct cycles for entry genes were normalized to Ct cycles of human hprt and relative expression data were expressed as 2e-ΔCt. Statistical significance was assessed using Mann-Whitney only on SH-SY5Y and SK-N-BE(2) cells with or without RA-based differentiation. *p < 0.05. Each box plots the median and extends from the 25th to 75th percentiles. Whiskers shows the min. and max. values. n = 4 independent samples per condition.