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Interacting selectively and non-covalently with a hypermethylated cap structure consisting of 7-methylguanosine (m(7)G) followed by four methylated nucleotides (cap 4): 7-methylguanosine-ppp-N6, N6, 2\'-O-trimethyladenosine-p-2\'-O-methyladenosine-p-2\'-O-methylcytosine-p-N3, 2\'-O-dimethyluridine Such caps are known to be found at the 5\' ends of SL RNAs of trypanosomatid protozoa. [GOC:krc, PMID:10880518, PMID:12121975]
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