Table 1. Mass-spectrometric analysis of IDM1, IDM2 and IDL1 co-purifying proteins.

IDM1 Purification
Protein Accession	Gene Accession	Protein	Score	Mass	Spectra	Unique Peptides	% Seq. Cov	% of IDM1
IPI00540986	AT3G14980	IDM1	4599	133697	236	52	39	100
IPI00545650	AT1G20870	IDL1	925	52470	36	16	39.7	81.5
IPI00524605	AT5G59800	MBD7	749	35127	40	12	40.8	83.7
IPI00531355	AT1G54840	IDM2	531	39712	42	12	37.2	80.8
IDM2 Purification
Protein Accession	Gene Accession	Protein	Score	Mass	Spectra	Unique Peptides	% Seq. Cov	% of IDM2
IPI00531355	AT1G54840	IDM2	4635	39712	247	27	53.6	100
IPI00540986	AT3G14980	IDM1	3621	133697	162	43	35.4	47.3
IPI00545650	AT1G20870	IDL1	970	52470	39	16	40.4	39.2
IPI00524605	AT5G59800	MBD7	484	35127	22	12	35.3	50.2
IDL1 (IDM2 Like 1) Purification
Protein Accession	Gene Accession	Protein	Score	Mass	Spectra	Unique Peptides	% Seq. Cov	% of IDL1
IPI00545650	AT1G20870	IDL1	3454	52470	159	36	62.6	100
IPI00540986	AT3G14980	IDM1	938	133697	41	13	13.1	14.6
IPI00524605	AT5G59800	MBD7	366	35127	21	10	35	34.1
IPI00531355	AT1G54840	IDM2	305	39712	20	8	22.1	30.2