thank you all for your answers. so we have gene A with complementary B, and only A's strand is coding and B is just for stability. if d.n.a. is antiparalel double helix it turns out that somewhere B will be in that strand where is A, and it will derive protain as well. so it is very strange for me, such coinsidence: A is needed for life, B is complementary and is needed for stability and in addition from it also is derived protains needed for life.

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