Based on GO analysis, 15,318 unigenes were annotated and divided into three categories: “biological process,” “cellular component,” and “molecular function” (Figure 1). The number of matched GO terms per unigene varied from 1 to 143. More than 89.1% of unigenes could be assigned to more than one GO term, with the majority of unigenes mapped to 2 to 7 GO terms. Based on GO analysis, three major functional groups were divided into 60 subcategories, including the dominant subcategories, cellular process (10955), cell (9486), cell part (9471), single-organism process (8860), metabolic process (8220), and binding (7958).