>3d90A (A:) observed residues (from ATOM records)
qlipplinllmsiepdviyaghdnpdtssslltslnqlgerqllsvvkwskslpgfrnlh
iddqitliqyswmslmvfglgwrsykhvsgqmlyfapdlilneqrmkessfyslcltmwq
ipqefvklqvsqeeflcmkvllllntipleglrsqtqfeemrssyirelikaiglrqgvv
sssqrfyqltklldnlhdlvkqlhlyclntfiqsralsvefpemmseviaaqlpkilagm
vkpllfh