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

它们都含有这种白质，但与我们人体制造出来的原肌球白不同。

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——一对漂亮的白质链，叫做肌动白和肌球白。

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

具体来说，棒状头肌球白想近距离接触肌动白。

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种叫做原肌球白的物质。

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

就像我们肌肉中的肌动白和肌球白一样，它们使我们能够移动。

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

肌动白和肌球白， 肌肉的白质， 允许这些身体四处移动。

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

当它解绑时，由的形状变化使原肌球白保镖恢复原位。

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肌动白-肌球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肌动白-肌球白纤维，类似于我们的肌肉组织。

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

也就是说，肌动白会被白质的保镖阻断——原肌球白和肌钙白——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，这时肌球白头一遍又一遍地结合、拉动和释放，肌肉纤维收缩。

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

球状体中肌动白-肌球白纤维的排列构成了一种结构，这种结构会被继承到新水螅的身体中。

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肌节的部分，其中包含两股更的白质——两种不同的肌丝称为肌动白和肌球白。

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

但是唯一能与这些新暴露的部位结合的肌球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.

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

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

在这一点上，肌球白完全兴奋起来，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肌就像一根由成束白质纤维组成的绳子，最的链是你的肌动白和肌球白肌丝。

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，因为肌动白-肌球白纤维稳定且排列整齐， 而外缘具有弹性， 可以跟随这些纤维的引导。

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!

当这些通道打开时，储存在其中的钙会涌入细胞的其余部分，最后肌球白就像，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， 形成了肌动白-肌球白纤维排列方式不同的球状体。