U-bodies are specific cytoplasmic RNA granules which are sites for for snRNP assembly aided by U-snRNPs and SMN (20452345).
Cauchi RJ, Sanchez-Pulido L, Liu JL. Drosophila SMN complex proteins Gemin2, Gemin3, and Gemin5 are components of U bodies. Exp Cell Res. 2010 Aug 15;316(14):2354-64. doi: 10.1016/j.yexcr.2010.05.001. Epub 2010 May 7. PMID: 20452345.