Fantastic Voyage : Microcosm

An unidentified flying object has been shot down from the sky-and a single strange pod has survived intact.
Now Team Proteus-a U.S.-Russian crew of scientists, doctors and technicians-will be reduced in size using new miniaturization techniques and injected through the surface of the pod. So begins the most startling voyage of exploration in human history...
Inside the body of an alien.
Praise for Kevin J. Anderson:
Arguably the most prolific, most successful author working in [science fiction] today. (Algis Budrys)
The heir apparent to Arthur C. Clarke. (Daniel Keys Moran, author of The Last Dancer )
A rare combination of talent and practicality. ( Starlog )
The hottest writer on (or off) the planet. ( Fort Worth Star-Telegram )