Table 1.

Description of dorsal and ventral SAGE libraries

SAGE library	Dorsal	Ventral	Total
Sequenced colonies	1,265	1,018	2,283
Repeated ditags	2,183 (12.2%)	359 (2.2%)	2,542 (7.4%)
Ditags*	15,773	16,057	31,830
Tags†	31,538	32,104	63,642
Linker tags	363	57	420
Total experimental tags	31,175	32,047	63,222
Unique experimental tags	14,546	14,486	23,766
Experimental tags matching to the genome	14,352	14,347	23,455

SAGE libraries were prepared from total RNA of dorsal and ventral explants of X. tropicalis gastrula. Concatemer sequences were processed for tag extraction and comparison between libraries. *Repeated ditags were considered only once. ^†Tags including 'N' in the sequence were not considered (eight tags in the dorsal library and ten tags in the ventral library).