Table 1.

Statistics of sequencing and de novo assembly of X. strumarium transcriptome.

Item	Sample	Number	Nucleotides (nt)	Valid ratio	GC (%)	N50 (bp)	Average length (bp)
Raw read	HT	56,775,466	ND	ND	ND	ND	ND
	HY	57,739,378	ND	ND	ND	ND	ND
	ZY	55,794,206	ND	ND	ND	ND	ND
Clean read	HT	52,073,570	4,686,621,300	91.7184	45.05	ND	ND
	HY	53,389,348	4,805,041,320	92.4661	44.11	ND	ND
	ZY	52,073,570	4,686,621,300	93.3315	44.00	ND	ND
Total	Unigenes	91,861	72,829,613	ND	44.39	1238	793

Valid ratio, the numbers of clean reads/ the numbers of raw reads.

N50, The largest length L such that 50% of all nucleotides are contained in contigs (or scaffolds) of size at least L (de Jong et al., 2001).

ND, no data.