You And Zack Wait For Results

"What are these tests you keep talking about?" you ask. "Take a look," Zack says. He follows you into the back room.

You see a row of cages, labeled MA, MB, PDA, PDB and so on. In each cage is a little white mouse.

"We're waiting to see which mice start to bleed," Zack goes on. "You thought it would take about an hour, right?"

"That's right," a new voice says from the doorway.

Continue with the mystery

An Access Excellence Science Mystery sponsored by Genentech, Inc.