BioHackersNet보통 SwissProt의 주석정도가 잘되있슴을 비교할때 이것과 비교한다. 엔트리수는 14만개 정도
PIR was established in 1984 and resulted from the work of Dr. MargaretDayhoff, Ph.D. Her Atlas of Protein Sequence and Structure, published from 1965-1978, was the first comprehensive collection of Protein sequences. In 1974, Dr. MargaretDayhoff devised the concept of the ProteinFamily and super-family, defined by sequence similarity, as a means of organizing and classifying Proteins. PIR's entries are organized in this manner and computer-annotated with functional and structural data.