Homo sapiens C/D box snoRNA U55. This snoRNA was cloned from HeLa cells by Kiss-Laszlo et al. (1996). It was independently discovered by a bioinformatics approach, and named U39, by Nicoloso et al. (1996). It is predicited to guide the 2'O-ribose methylation of 28S rRNA C2791. U55 shares the same host gene with the C/D box snoRNAs U38A, U38B and U40/U46 (RPS8).