/usr/share/massxpert/pol-seqs/ is in massxpert-data 3.2.0-2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/massxpert/pol-seqs/17-mer-ps-po-dna-chimera.mxp
/usr/share/massxpert/pol-seqs/centrin-2-human.mxp
/usr/share/massxpert/pol-seqs/cerulean-histag.mxp
/usr/share/massxpert/pol-seqs/chicken-telokin.mxp
/usr/share/massxpert/pol-seqs/citrin-fluorescent-protein.mxp
/usr/share/massxpert/pol-seqs/cyan-fluorescent-protein-h148d-histag.mxp
/usr/share/massxpert/pol-seqs/cyan-fluorescent-protein.mxp
/usr/share/massxpert/pol-seqs/horse-myoglobin.mxp
/usr/share/massxpert/pol-seqs/insulin-a-ox.mxp
/usr/share/massxpert/pol-seqs/insulin-b-ox.mxp
/usr/share/massxpert/pol-seqs/kunitz-inhibitor-human.mxp
/usr/share/massxpert/pol-seqs/leu-enkephalin.mxp
/usr/share/massxpert/pol-seqs/protein-1-letter.mxp
/usr/share/massxpert/pol-seqs/protein-3-letters.mxp
/usr/share/massxpert/pol-seqs/tev-protease-his-tag.mxp
/usr/share/massxpert/pol-seqs/yellow-fluorescent-protein.mxp