The genetic engineers experimented on passive zerg, and security guards and pyrotechnic engineers were assigned to protect them. They also healed UED troops during the battle. However, Kerrigan's forces defeated them, and the formerly passive zerg rampaged across the battlefield.
Medics use this ability to automatically heal friendly biological units in range.
1 (per 2 hit points)
Medics remove parasite, ensnare, plague, devourer's corrosive acid (removes all multipliers of acid in one cast), maelstrom, lockdown, optical flare, and irradiate, from a targeted unit; a single cast removes any combination and number of negative buffs from the above list from the target unit.
Restoration can be cast on any friendly or allied unit.