Table I.

Comparison of exon lengths among SBE II genes^a

Exon No.	Arabidopsis SBE2.1	Arabidopsis SBE2.2	Wheat SBEIIa	Maize SBEIIb
1	42	124	279	212
2	252	119	98	146
3	236	182	242	157
4	99	99	99	99
5	43	43	43	43
6	60	60	60	60
7	81	81	81	81
8	117	117	117	117
9	84	84	84	84
10	122	122	122	122
11	120	120	120	120
12	130	130	130	130
13	111	111	111	111
14	129	129	129	129
15	104	104	104	104
16	145	145	145	145
17	558b	148	148	148
18	–	101	101	101
19	–	78	78	78
20	–	156	156	156
21	–	75	75	75
22	–	90	384	304
18c	164	–	–	–

^a Arabidopsis SBE2.1 (Genbank accession no. AJ000497), Arabidopsis SBE2.2 (Genbank accession no. AL162506.1), wheat SBE IIa (this paper), and maize SBEIIb (Genbank accession no. AF072725). 

^b The sequence in exon 17 of the Arabidopsis SBE2.1 gene shows high levels of identity with the sequence in exons 17 to 21 of the Arabidopsis SBE2.2 gene. 

^c Exon 18 of the Arabidopsis SBE2.1 gene.