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reported in UniProtKB, in the sample (SEQRES), or as observed in the
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The structure 4I21 has in total 4 chains.
These are represented by 2 sequence-unique entities.
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Currently displayed SEQRES sequence.
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The PDB to UniProt mapping is based on the data provided by the EBI
project. See also Velankar et al., Nucleic
Acids Research 33,
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