It is used as a reference number for Recombinant Human Anti-Matrix protein 1 , a soluble T-cell receptor used in viral research.
The MMP9 gene (Matrix Metallopeptidase 9) provides instructions for making an enzyme that breaks down the extracellular matrix—the "scaffold" that holds cells together.
The number does not refer to a standard U.S. ZIP code. In the United States, ZIP codes are five-digit numbers ranging from 00501 to 99950. However, "156835" is a specific identifier frequently used in biotechnology and biological research, most notably as a catalog number for genetic tools. The Role of siRNA 156835 in Cellular Biology
While the primary scientific reference is the siRNA catalog number, "156835" also appears in other specialized databases: