Needle in a haystack

Hello Good morning to all my dear friends my name is Kamal, today I am  going to talk on needle haystack. According to my understanding

something that is impossible or extremely difficult to find, especially because the area you have to seach is too large:


Finding the piece of paper I need in this huge pile of documents is like for looking/trying to find a needle in a haystack Without prior knowledge of changes in specific hormone or hormone receptor levels, however, a candidate gene approach resembles an attempt to find a needle in a haystack.

Thank you

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