TFRC and COVID-19: Moreover, erythrocyte precursors (ERY-P) were detected almost exclusively in the COVID-19 liver (FDR = 2.37 × 10−6, OR = 12.554, Binomial GLMM), expressing a combination of hemoglobin and glycophorin genes, proliferation genes, and additional genes not present in mature red blood cells, such as CD71/TFRC, which are rarely encountered outside the bone marrow in adults.