This file points to 7 pairs of files of the form    "?pk*"
("?" is a single-character wildcard and "*" is a multiple-character wildcard.)

Crossing File	Backbone Overlay
1pk5_A	1pk5_A_sse
1pk6_A	1pk6_A_sse
1pk6_C	1pk6_C_sse
1pkh_A	1pkh_A_sse
1pkl_A	1pkl_A_sse
1pko_A	1pko_A_sse
1pkp	1pkp_sse