IE1 peptide refers to an antigenic peptide encoded by the immediate early (IE) gene of mouse cytomegalovirus (mCMV). IE1 peptide is one of the key antigenic peptides expressed during mCMV infection, plays a role in transcriptional activation in the life cycle of mCMV, and is one of the earliest genes expressed in the viral replication cycle. IE1 peptide is an important target for CD8+ T cell response and can be used to study the host immune response to mCMV infection.

The T7 tag (MASMTGGQQMG) is a peptide with 11 amino acids encoded in the leader sequence of T7 bacteriophage gene10. This gene encodes a T7 major capsid protein.

GAST gene encodes for the protein [Leu15]-Gastrin I in human.?In human chromosome, the gene GAST is localized on 17q21.2.?G cells in the stomach antrum produces the precursor of [Leu15]-Gastrin I, progastrin.