Figure 1.

Optical densities (OD) through five freeze-thaw cycles. Mean optical densities (OD) for positive (black diamonds) and negative (black squares) clean sera, and for positive (grey diamonds) and negative (grey squares) haemolysed sera (┬▒ standard error, SE) through the five freeze-thaw cycles (Freezing 1 to 5).

Boadella and Gort├ízar BMC Research Notes 2011 4:498   doi:10.1186/1756-0500-4-498
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