一些内切酶如Hae 皿和Hpa I切割产生的DNA 片段没有黏性末端，而是平端(bluntend,也叫钝端)。具有平端的酶切载体只能与平端的目的基因连接。T4 DNA 连接酶可催化相同和不同限制性核酸内切酶切割的平端之间的连接。
鱼翅是身高和后备圆锥与钝端和整流罩在市场领先优势。
Fin is tall and back-tapered with a blunt tip and fairing in the leading edge.
在使用状态，插针头的尖端稍高于插针的末端，而在不使用状态，插针头的钝端也稍高于插针的末端。
Under the use state, the tip of the pinhead is higher than the side of the pin and under the non-use state, the blunt side of the pinhead is slighter than the side of the pin.
同时，晶界沉淀物的端部由尖锐变得圆钝，晶界临近区域中的合金元素贫化，使材料的应力腐蚀抗力提高。
Meanwhile, the tip of precipitates along grain boundary becomes obtuse, the alloying elements are depleted in the region near the grain boundary and the stress corrosion resistance is bettered.
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