Base-compositional biases and the bat problem -- 1. DNA-hybridization melting curves based on AT- and GC- enriched tracers / John D. Pettigrew and John A.W. Kirsch. -- 2. DNA-hybridization trees based on AT- and GC- enriched tracers / John A.W. Kirsch and John D. Pettigrew. -- 3. The question of microchiropteran monophyly / James M. Hutcheon, John A.W. Kirsch and John D. Pettigrew.