snoRNA Z256 belongs to the C/D box class of snoRNAs which contain the conserved sequence motifs known as the C box (UGAUGA) and the D box (CUGA).
The snoRNA Z256 is classified as a member of the C/D box category of snoRNAs, which are distinguished by the presence of specific sequence motifs, namely the C box (UGAUGA) and the D box (CUGA).