Table III.

Positions and lengths of introns in Arabidopsis SHM genes

Intron no.	Intron Length (nt)
	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23
Intron	Ma	Ta	Ka	Rc	Ec	Vb	Ma	Qa	Gb	Qa	Ka	Eb	Ka	Ea	Qa	Qa	Qa	Qa	Ka	Gb	Gb	Gb	Gb
Positiond	29	46	75	110	116	142	168	183	208	214	245	269	286	311	329	346	358	368	394	398	419	432	469
SHM1	106e	171	95	–f	104	79	–	84	–	87	78	–	–	87	–	81	–	82	80	–	–	81	83
SHM2	79	88	91	–	80	93	–	116	–	172	81	–	–	90	–	164	–	130	328	–	–	287	84
SHM3	–	–	–	88	–	–	84	–	79	–	112	–	97	–	86	–	93	–	107	–	244	–	–
SHM4	–	–	–	–	–	–	–	–	–	–	–	409	–	–	–	–	–	–	–	91	–	93	–
SHM5	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–	85	–	75	–

^aIntron follows the codon encoding the indicated amino acid residue. 

^bIntron inserted between the first and second nucleotides of the codon encoding the indicated amino acid residue. 

^cIntron inserted between the second and third nucleotides of the codon encoding the indicated amino acid residue. 

^dBased on Arabidopsis SHM1, to which all the others were aligned. The amino acid residue listed is that of Arabidopsis SHMT1. 

^eIntron length in nt. 

^fIntron not present.