  Data compression plays an important role to deal with high volumes of DNA
sequences in the field of Bioinformatics. Again data compression techniques
directly affect the alignment of DNA sequences. So the time needed to
decompress a compressed sequence has to be given equal priorities as with
compression ratio. This article contains first introduction then a brief review
of different biological sequence compression after that my proposed work then
our two improved Biological sequence compression algorithms after that result
followed by conclusion and discussion, future scope and finally references.
These algorithms gain a very good compression factor with higher saving
percentage and less time for compression and decompression than the previous
Biological Sequence compression algorithms. Keywords: Hash map table, Tandem
repeats, compression factor, compression time, saving percentage, compression,
decompression process.
