the top of the shoelace
绑带尖头鞋 lace up pointed shoes
这是染色体末端的帽子，保护内部的DNA不受破坏，就像鞋带头上的绳花让鞋带不散毛。
These are caps on the ends of chromosomes that protect the DNA in them from damage, much like caps on shoelaces prevent fraying.
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