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. 2021 Mar 30;12:660194. doi: 10.3389/fimmu.2021.660194

Figure 1.

Figure 1

Four specific unmet challenges for the Factor H protein Family. The major challenges ahead in this emerging area are: 1. the controversies about the functional roles of the Factor H protein family, 2. the discrepancies in quantification of the Factor H protein family, 3. the unmet needs for validated tools and 4. limitations of animal models.