To examine the molecular mechanisms underlying acquired higher thermal resilience in preconditioned corals, we first analyzed the early hyperthermal stress response of PC and NPC corals by RT-qPCR. We sampled PC and NPC corals (n = 10 per conditioning) exposed to 32ÂșC at 0, 1, 3, 6, 12, 24, 48, and 72 hours.