Alternatives to radiators for spaceships

I'm doing research for a space opera with some hard sci-fi elements. One faction does use radiators (dusty plasma particles held in magnetic fields- which would create the effect of glowing wings on warships) for their starships, while I'm thinking another faction would use something else so I'm open for ideas.

This other faction centers on genome manipulation instead, so I figure their starships would be using something akin to biological heatsinks? Or perhaps they engineer microorganisms that could absorb heat and cool off using some sort of reverse exothermic reaction? Any ideas welcome.

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Alternatives to radiators for spaceships

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