This file points to 4 pairs of files of the form    "?kx*"
("?" is a single-character wildcard and "*" is a multiple-character wildcard.)

Crossing File	Backbone Overlay
1kxg_A	1kxg_A_sse
1kxo_A	1kxo_A_sse
1kxp_D	1kxp_D_sse
1kxv_C	1kxv_C_sse