The Mouse 430A chip contains primarily probe sets against well annotated full-length genes. The Mouse 430B chip contains probe sets against gene clusters containing only EST sequences and some gene clusters with non-EST sequences.

Classification	Mouse 430A	Mouse 430B
Full Lengths	14,484	0
Full Length End and Strong Evidence for Polyadenlation	6839	0
Strong Evidence for Polyadenylation	2408	0
Full Length End	4452	0
Consensus End	785	0
Non-ESTs (excluding Full Lengths)	3771	5679
Strong Evidence for Polyadenylation	1880	1510
Consensus End	1891	4169
ESTs	4371	16732
Strong Evidence for Polyadenylation	3362	4979
Library Coverage > 1
Evidence for Polyadenylation > 1	260	11509
Single Evidence for Polyadenylation	50	51
No Direct Evidence for Polyadenylation	108	37
Single Library Coverage
Evidence for Polyadenylation > 1	28	7
Single Evidence for Polyadenylation	297	85
No Direct Evidence for Polyadenylation	266	64