Recent accounts of “the biological” emphasize its thoroughgoing transformation. Accounts of biomedicalization, biotechnology, biopower, biocapital, and bioeconomy tend to agree that twentieth- and twenty-first-century life sciences transform the object of biology, the biological. Amidst so much transformation, we explore attempts to stabilize the biological through standards. We ask: how do standards handle the biological in transformation? Based on ethnographic research, the article discusses three contemporary postgenomic standards that classify, construct, or identify biological forms: the Barcoding of Life Initiative, the BioBricks (...) Assembly Standard, and the Proteomics Standards Initiative. We rely on recent critical analyses of standardization to suggest that any attempt to attribute a fixed property to the biological actually multiplies dependencies between values, materials, and human and nonhuman agents. We highlight ways in which these biological standards cross-validate life forms with forms of life such as publics, infrastructures, and forms of disciplinary compromise. Attempts to standardize the biological, we suggest, offer a good way to see how a life form is always also a form of life. (shrink)