imp_hema:	"imp(c1) vs hema(c1)",
i_h(bg1):	"imp(c1) vs hema (notc1)",
i_h(bg2):	"imp(c1) vs random genes of size hema c1"
imp_pluri:	"imp(c1) vs pluri(c1)",
i_p(bg1):	"imp(c1) vs pluri (notc1)",
i_p(bg2):	"imp(c1) vs random genes of size pluri c1",
plur_hema:	"pluri(c1) vs hema(c1)",
p_h(bg1):	"pluri(c1) vs hema (notc1)",
p_h(bg2):	"pluri(c1) vs random genes of size hema c1"