She saw motion on the screen and ran to check it; the DORD was already displaying and categorizing some preliminary images. She flipped through the list and opened one for the compound labeled M, a funny little horseshoe-shaped particle. The DORD had found several structures in Samm’s body that it thought might be related to it: one in the nasal cavity and the rest in the lungs. Kira pulled them up, side by side on the screen, and studied them; they looked almost like glands, though not any glands Kira was familiar with. The one in his sinuses was significantly larger, and the DORD had cross-linked it to several other files. Kira opened the list and flipped through it quickly, mildly surprised at what she saw; the DORD had linked that image to every compound it had scanned for thus far. They each had a little gland of their own in the lungs, but they were all connected to the big one in his head.

Kira studied the gland closer while the DORD kept working. What did it do? She couldn’t just ask the computer to guess, but she could ask it to search its database for partial matches. She started the search and looked back at the image again, buckling down for another long wait, but the results were almost instantaneous: no match. She frowned and ran the test again. No match.

Guess I’m going to have to do this manually. Given that each particle had two related structures, the obvious first guess was that one structure created the particle and the other one caught it: a writer and a reader. Which implied that they carried information. She ran another search, this time looking for anything in the database that wasn’t human. The DORD found an old file, pre-Break, where somebody had scanned a dog, and she asked the computer to look for partial matches in there. One popped up almost immediately, displaying a structure remarkably similar, though far simpler, than the one in Samm. It was a vomeronasal organ.

Samm had an incredibly sophisticated pheromonal system.

Kira pulled up more files, reading what she could on pheromones: They were a system of simple chemical communication, like a form of smell but far, far more specialized. Insects used them for simple things like marking trails or warning one another of danger; dogs used them to claim territory and to signal breeding times. What did the Partials use them for?

I may as well try asking, she thought. “Tell me about your … pheromones.” Predictably, Samm said nothing. “You have a highly developed system of chemical synthesizers and receptors; can you tell me about it?”

No response.