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. Author manuscript; available in PMC: 2012 Jan 1.
Published in final edited form as: Biologicals. 2010 Oct 20;39(1):29–32. doi: 10.1016/j.biologicals.2010.09.003

Figure 2.

Figure 2

The effect of freeze-thaw cycle(s) on MCP-1 stability. MCP-1 solutions that were stored at −20°C or −81°C, as described in Figure 1, were collected and stored at the same conditions for an additional day. The concentration of MCP-1 after the second thaw was determined by ELISA. Results from both −20°C (2A) and −81°C (2B) storage temperatures were compared to those shown in Figure 1. Values are represented as mean ± SD, * p < 0.05 and ** p < 0.01 for changes in MCP-1 concentration after the second thaw, compared to results from the first thaw.