Table 4. Summary of AtSS1 equivalent Cys residues in aligned sequences.

The presence of an equivalent Cys residue is indicated with “+” and the absence is indicated with the corresponding amino acid substitution. Additional information including species taxonomy and protein sequence accession number is listed in the S6 Table.

Protein	Cys164	Cys209	Cys261	Cys265	Cys442	Cys458	Cys533	Cys545
Dicotyledoneae
Vv_SS1	+	+	+	+	+	+	+	+
Mt_SS1	+	+	SER	+	+	+	+	+
St_SS1	+	+	SER	+	+	+	+	+
Ca_SS1	+	+	SER	+	+	+	+	+
Gm_SS1	+	+	+	+	+	+	+	+
Me_SS1	+	+	+	+	+	+	+	ARG
Fv_SS1	+	+	ALA	+	+	+	+	+
Tc_SS1	+	+	+	+	+	+	+	+
Pt_SS1	+	+	+	+	+	+	ALA	+
Cs_SS1	+	+	+	+	+	+	+	+
Monocotyledoneae
Ta_SS1	+	+	+	+	+	VAL	+	+
Bd_SS1	+	+	+	+	+	ILE	+	+
Os_SS1	+	+	+	+	+	VAL	+	+
Zm_SS1	+	+	+	+	+	VAL	+	+
Hv_SS1	+	+	+	+	+	VAL	+	+
Lycopodiophyta
Sm_SS1	+	+	+	+	+	VAL	+	+
Bryophyta
Pp_SS1	+	+	+	+	+	VAL	+	+
Charophyta
Kf_SS1	ILE	+	+	+	SER	VAL	+	+
Chlorophyta
Ot_SS1	+	+	ALA	+	+	VAL	+	+
M_sp_SS1	+	+	SER	+	ASN	VAL	+	+
Mp_SS1	+	+	SER	+	+	VAL	+	+
Bp_SS1	+	+	ALA	+	+	VAL	VAL	+
Cr_SS1	LEU	PHE	ALA	-	+	ILE	ALA	+
Vc_SS1	MET	GLY	+	+	+	ALA	SER	+
Cyanobacteria
N_sp_GS	VAL	LYS	SER	ALA	ASN	ALA	THR	+
C_sp_GS	VAL	GLN	ALA	ALA	ASN	THR	ILE	+
S_sp_GS	VAL	LYS	SER	ALA	ASN	ALA	ALA	+
Pm_GS	VAL	THR	ALA	ALA	ASN	LYS	SER	+
Gv_GS	VAL	THR	SER	ALA	ASN	ARG	ALA	+
Bacteria
Ec_GS	ILE	THR	GLY	ALA	ASN	VAL	ALA	+
Ta_GS	VAL	TYR	SER	PHE	ASN	VAL	SER	+
Euryarchaeota
To_GS	VAL	ALA	PHE	SER	ARG	GLY	VAL	PHE
Mf_GS	MET	TYR	ALA	VAL	SER	THR	SER	+
Mm_GS	LEU	TYR	ALA	VAL	SER	THR	+	+