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Here's the original url for the image, url=http://www.ncbi.nlm.nih.gov/Structure/mmdb/domThumbnail.fcgi?sdi=168216.
I am backtracking the url portions to see what I can find. The NCBI Structure Group has a new url=http://www.ncbi.nlm.nih.gov/Structure/index.shtml. Inputting the structure identification, MMDB ID: 168216 did not work. Inputting RPB1 brings up 135 structure pictures, but none of these match the image I uploaded. It may be EC 188.8.131.52 or EC 184.108.40.206. HUGO uses EC 220.127.116.11. I am noticing that many of the structure models have been modified since I uploaded this one.
The protein number is NP_000928.1. Not having any luck!