Refer to the figure. 
In humans, STAT6, STAT5a, and STAT5b transcription factors are paralogs.According to the phylogenetic gene tree shown, since the gene duplication event that gave rise to the STAT6 and STAT5 lineages, how many gene duplication events have occurred to generate human STAT5a and human STAT5b?
A) One
B) Two
C) Three
D) Five
E) Six
Correct Answer:
Verified
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