MRTO4 and infection: Concordantly, the mRNA expression levels of genes related to ribosome biogenesis (Urb2, coding for unhealthy ribosome biogenesis protein 2, Wdr75, coding for WD repeat domain 75, Zfp593, coding for zinc finger protein 593, Mrto4, coding for MRT4 homolog, ribosome maturation factor and Nop58, coding for nucleolar protein 58) were enhanced upon in vitro infection in preadipocytes and not in adipocytes (Fig. 7c).