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Nano-tek is required for the insidious Regrowth ability of the Bloons.
~ Official BMC description

Rubber Repair Nano-tek is a building in Bloons Monkey City. It is required to research for Regrowth Bloons in the Bloon Research Lab. With it, players can send Regrowth Bloons against other players as well as Regrowth Assaults.

The building's animation shows a Regrow Green bloon be popped twice with a small cloud of smoke, then slowly regenerate back to green. On mobile, it's a holographic effect of regrowth.

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