Most efficient way to store a big DNA sequence?

Question

I want to pack a giant DNA sequence with an iOS app (about 3,000,000,000 base pairs). Each base pair can have a value A, C, T or G

Answer 1

You can use the tools like MFCompress, Deliminate,Comrad.These tools provides entropy less than 2.That is for storing each symbol it will take less than 2 bits