NXCI_032_D06_F NXCI (Nsf Xylem Compression wood Inclined) Pinus taeda cDNA clone NXCI_032_D06 5' similar to Arabidopsis thaliana sequence At5g20620 polyubiquitin 4 UBQ4 see http://mips.gsf.de/proj/thal/db/index.html, mRNA sequence