Well, they share that protein and it's very different from anything our bodies make.

它们都含有白质，但与我们人体制造出来的原白不同。

They've got their own famous coupling — a pretty pair of tiny protein strands called actin and myosin.

它们有自己著名的联结——一对漂亮的微小白质链，叫做动白和白。

Specifically, that club-headed myosin wants to get all up-close-and-personal with the actin.

具体来说，棒状头白想近距离接触动白。

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

虾等甲壳类动物和尘螨都是无脊椎动物，它们之所以会触发过敏反应是因为一叫做原白的物质。

Like the actin and myosin in our muscles that enable us to move.

就像我们肉中的动白和白一样，它们使我们能够移动。

Actin and myosin, the proteins of muscles, permit those bodies to move around.

动白和白， 肉的白质， 允许些身体四处移动。

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

当它解绑时，由此产生的形状变化使原白保镖恢复原位。

Open rings did even worse – that extra cut made figuring out actomyosin alignment even trickier.

开口环的效果更差——那个额外的切口使得确定动白-白纤维的排列更加困难。

Hydra have thin, parallel actomyosin fibers running throughout their body, like our muscle tissue.

水螅体内分布着细长且平行的动白-白纤维，类似于我们的肉组织。

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

也就是说，动白会被白质的保镖阻断——原白和钙白——它们一直碍事。

Then comes a brief period of contraction, when the myosin heads are binding, and pulling, and releasing, over and over, and the muscle fibers contract.

然后是短暂的收缩，时白头一遍又一遍地结合、拉动和释放，肉纤维收缩。

The alignment of actomyosin fibers in the spheroid lays out a structure that gets inherited throughout the new hydra’s body.

状体中动白-白纤维的排列构成了一结构，结构会被继承到新生水螅的身体中。

They're divided lengthwise into segments called sarcomeres, which contain two even tinier strands of protein — two different kinds of myofilaments called actin and myosin.

它们在纵向上被分成称为节的部分，其中包含两股更小的白质——两不同的丝称为动白和白。

But the only myosin heads that can bind to those newly exposed sites are ones that are ready for action.

但是唯一能与些新暴露的部位结合的白头是那些准备好行动的。

A sarcomere contains both thin filaments, made up mostly of two light and twisty actin strands, and thick filaments, composed of thicker, lumpy-looking myosin strands.

节既包含细丝，主要由两条轻盈而扭曲的动白链组成，也包含粗丝，由更厚、看起来块状的白链组成。

At this point, the myosin is totally stoked, because the bodyguards that have been frustrating it are in for a big, irresistible distraction.

在一点上，白完全兴奋起来，因为一直让它沮丧的保镖会有一个巨大的、不可抗拒的分心。

You'd also re-learn that your skeletal muscles are constructed like a rope made of bundles of protein fibers, and that the smallest strands are your actin and myosin myofilaments.

你还会重新了解到你的骨骼就像一根由成束白质纤维组成的绳子，最小的链是你的动白和白丝。

Square tissue chunks folded really well, because the actomyosin fibers were stable and aligned, and the outer edges were flexible and could follow those fibers’ lead.

方形组织块折叠得很好，因为动白-白纤维稳定且排列整齐， 而外缘具有弹性， 可以跟随些纤维的引导。

When those channels are thrown open, the calcium stored inside rushes into the rest of the cell, and finally myosin is like, YES! Here we go!

当些通道打开时，储存在其中的钙会涌入细胞的其余部分，最后白就像，是的！开始了！

On the other hand, slices of hydra shaped like closed rings didn’t fold so well, and formed spheroids with different regions of actomyosin aligned in different ways.

另一方面，呈闭合环状的水螅切片折叠得不好， 形成了动白-白纤维排列方式不同的状体。