Reptiles have placodes too. But in a reptile embryo each placode switches on genes that cause only the skin cells on the back edge of the placode to grow, eventually forming scales.

爬行动物身上同样存在基板，但在胚胎阶段时，它们只会触发基板后延的皮肤细胞基因进行增殖，并最终形成鳞片。

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The back edge of the machine is completely taken up by the vent, which will make its presence known quite frequently (more on that when we dive into performance).

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It would be an understatement to say there's been a long build-up to the moment when Voyager 1 ventures into interstellar space: scientists thought the probe was on the edge back in 2010, and we've been waiting for the official milestone ever since.

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Fabiano, who scored twice in the 4-1 Spanish league win over Real Zaragoza at the weekend, broke the deadlock on the stroke of half-time after Renato broke down the left and pulled the ball back to the edge of the area -- where Fabiano was waiting to slot home confidently.

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