SNORA13 and osteosarcoma: In the group of snoRNAs characterized by one or two chromosomal localizations, and by a known host gene, only three, namely SNORD3A, SNORA13, and SNORA28, displayed a good correlation between their increase and the increase in the host gene mRNA and protein, suggesting that their processing in osteosarcoma cells was complete and produced functioning snoRNAs.