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4kq0 is a 4 chain structure with sequence from Tomato bushy stunt virus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
P19_TBSVK Viral suppressor of RNA silencing which binds specifically to silencing RNAs (siRNAs). Acts as a molecular caliper to specifically select siRNAs based on the length of the duplex region of the RNA (By similarity).