It Usually Is
In the vast majority of cases, the white string inside an egg is completely normal. It is called the chalaza, with the plural form being chalazae.
The chalaza is not a vein, embryo, or worm. It is a twisted strand of protein that helps anchor the yolk in place inside the egg white.
The Chalaza Helps Keep the Yolk in Place
The chalaza works somewhat like a small suspension system inside the egg. It helps keep the yolk positioned near the center and prevents it from moving
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