"Organic of course."
"Bacteria." Veena shrugged. "Quite a few of the first generation
died immediately after the landing. Until they adapted. Until they
analyzed the basic metabolism of the planet's dominant life-forms, and
constructed a neutralizer."
"A neutralizer?"
"A protective shell of ionized particles," she said patiently, "keyed
to the individual body-chemistry."
"Classified information," Mentor droned.