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. 2017 Apr 4;17:244. doi: 10.1186/s12879-017-2362-4

Fig. 1.

Fig. 1

a Negatively and positively SDHG-stained eggs. b SDHG staining with or without heat inactivation. No color change, negative (−); uneven light purple, weakly positive (+); even purple reaction, positive (++); dark violet, strongly positive (+++)