This file is indexed.

/usr/share/ncbi/data/ncbirnam.dat is in ncbi-data 6.1.20120620-2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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> a '>' or a ';' in the first column is a comment and is ignored
BamHI
EcoRI
HindIII
PstI