COP8 (CONSTITUTIVE PHOTOMORPHOGENIC 8). Identical to COP9 signalosome complex subunit 4 (CSN4) [Arabidopsis Thaliana] (GB:Q8L5U0;GB:Q9FMM1;GB:Q9SW74); similar to 26S proteasome regulatory subunit, putative (RPN5) [Arabidopsis thaliana] (TAIR:AT5G64760.1); similar to 26S proteasome regulatory subunit, putative (RPN5) [Arabidopsis thaliana] (TAIR:AT5G64760.2); similar to unnamed protein product [Vitis vinifera] (GB:CAO61183.1); similar to hypothetical protein [Vitis vinifera] (GB:CAN77214.1); similar to unknown [Populus trichocarpa] (GB:ABK93600.1); contains InterPro domain Winged helix repressor DNA-binding (InterPro:IPR011991); contains Inte