RUB1 (RELATED TO UBIQUITIN 1). Identical to NEDD8-like protein RUB1 precursor (RUB1) [Arabidopsis Thaliana] (GB:Q9SHE7;GB:Q0WQU3); similar to UBQ7 (RELATED TO UBIQUITIN 2) [Arabidopsis thaliana] (TAIR:AT2G35635.1); similar to Os09g0420800 [Oryza sativa (japonica cultivar-group)] (GB:NP_001063199.1); similar to polyubiquitin 2 [Deschampsia antarctica] (GB:AAM22748.1); contains InterPro domain Ubiquitin; (InterPro:IPR000626)