Sequence alignment between 6j6q(h) and UniProt seq P54999 (RUXF_YEAST):

P54999 (RUXF_YEAST): Small nuclear ribonucleoprotein F from Saccharomyces cerevisiae (strain ATCC 204508 / S288c)
                 10        20        30        40        50        60        70        80      
         ---------+---------+---------+---------+---------+---------+---------+---------+------
UniProt: MSESSDISAMQPVNPKPFLKGLVNHRVGVKLKFNSTEYRGTLVSTDNYFNLQLNEAEEFVAGVSHGTLGEIFIRCNNVLYIRELPN
         ............................................................XXXX......................
PDB seq: -----------PVNPKPFLKGLVNHRVGVKLKFNSTEYRGTLVSTDNYFNLQLNEAEEFV----HGTLGEIFIRCNNVLYIRE---
                    --------+---------+---------+---------+---------+    -----+---------+---   
                           20        30        40        50        60        70        80