RUB3 (UBIQUITIN-RELATED PROTEIN 3). Identical to NEDD8-like protein RUB3 precursor (RUB3) [Arabidopsis Thaliana] (GB:O65381); similar to RUB1 (RELATED TO UBIQUITIN 1) [Arabidopsis thaliana] (TAIR:AT1G31340.1); similar to unknown [Populus trichocarpa] (GB:ABK94272.1); similar to unknown [Populus trichocarpa] (GB:ABK94447.1); similar to polyubiquitin [Populus tremula x Populus tremuloides] (GB:AAF70460.1); contains InterPro domain Ubiquitin; (InterPro:IPR000626)