NRPD2b (nuclear RNA polymerase D 2b); DNA binding / DNA-directed RNA polymerase. similar to NRPD2a (NUCLEAR RNA POLYMERASE D 2A), DNA binding / DNA-directed RNA polymerase [Arabidopsis thaliana] (TAIR:AT3G23780.1); similar to unnamed protein product [Vitis vinifera] (GB:CAO44343.1); similar to RNA polymerase IV second largest subunit [Rhododendron macrophyllum] (GB:AAY68198.1); similar to RNA polymerase IV second largest subunit [Zea mays] (GB:AAY45706.1); contains InterPro domain RNA polymerase, beta subunit, protrusion; (InterPro:IPR007644); contains InterPro domain RNA polymerase Rpb2, domain 3; (InterPro:IPR007645); contains InterPro doma