最佳答案
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gag is one of the three "main" genes found in all retroviruses (along with env and pol). It contains around 1500 nucleotides, and encodes four separate proteins which form the building blocks for the viral core:
1. Capsid protein, CA, p24
2. Matrix protein, MA, p17 (this protein isn't actually part of the viral core but the "matrix" which anchors the core to the viral envelope)
3. Nucleocapsid protein, NC, p9
4. p6
The most significant role of the gag gene is therefore to encode important proteins which will make up the viral core.
