1 [with object] Biology Treat (a biological substance or specimen) with a second fixative.
- A portion of this specimen was postfixed in B - 5 fixative.
- Cells were postfixed in 1% osmium tetroxide in 0.1 M cacodylate buffer for 50 min.
- In some cases the cells were postfixed for 90 min in a solution of 1% osmium tetroxide in PBS.
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