Table 3.

The mean and standard deviation (std) of the GC content level in the four consistently selected genomic regions for mesophilic and thermo/hyperthermo-philic organisms, the genes corresponding to these four genomic regions and their functional annotations.

KO Group	Function Description	mean±std
		mesophilic	thermo/hyperthermo-philic
K01251	Adenosylhomocysteinase	57.35 ± 9.13%	48.61 ± 10.47%
K03724	DNA repair and recombination proteins	62.17 ± 11.85%	47.90 ± 12.99%
K07588	LAO/AO transport system kinase	62.03 ± 9.96%	49.10 ± 13.40%
K09122	Poorly Characterized	66.04 ± 10.26%	45.43 ± 11.03%