Commissioning a tissue-culture suite is mostly a documentation exercise that happens to involve laboratories. Before the first in-vitro assay is run, someone has to demonstrate that every consumable, diluent and lyophilised peptide entered the building through a traceable route — and that trail begins with how the order itself was constructed. Peptide and diluent should appear as separate lines in the basket, every time. It is a small discipline at the point of ordering and a disproportionately large one at the point of audit. Why peptide and diluent belong on separate basket lines On a busy commissioning day, a basket entry that reads as a combined “peptide plus diluent” item…