When it unbinds, the resulting shape-change puts the tropomyosin bodyguards back into place.

当它解绑时，由此产生形状变化使原肌球保镖恢复原位。

Now shrimp shellfish and dust mites are all invertebrates and all of them trigger allergies thanks to a protein called tropomyosin.

虾等甲物和尘螨都是无脊椎物，它们之所以触发过敏反应是因为一种叫做原肌球物质。

Namely, actin is blocked by a couple of protein bodyguards — called tropomyosin and troponin — which keep getting in the way.

也就是说，肌被质保镖阻断——原肌球和肌钙——它们一直碍事。

Immediately after a muscle fiber is stimulated by a nerve — when calcium ions are flooding into the sarcomeres to pull away those two protein bodyguards of tropomyosin and troponin from the actin — that's called the latent period.

肌肉纤维被神经刺激后立即——钙离子涌入肌节，将肌中保护原肌球和肌钙质带走——这称为潜伏期。

So the calcium latches on to the troponin and causes it to pull the other bodyguard protein — the tropomyosin — away from the sites on the actin strands that the myosin really wants to get its paws on.

所以钙锁住肌钙，并使其将另一种保护——原肌球——从肌球真正想要抓住肌链上位置拉走。