Table 1. Vertebrate Selenoproteins.

Selenoproteins	Commonly used abbreviations	Fish	Frog	Birds	Mammals
					Platypus	Marsupials	Placentals
15 kDa selenoprotein	Sep15, Sel15	+	+	+	+	+	+
Fish 15 kDa selenoprotein-like	Fep15	+
Glutathione peroxidase 1a	GPx1, GSHPx1, GPx, cGPx	+	+	+	+	+	+
Glutathione peroxidase 1b	GPx1b	+
Glutathione peroxidase 2	GPx2, GSHPx-GI, GPRP, GI-GPx, GSGPx-2	+	+	+	+	+	+
Glutathione peroxidase 3	GPx3, pGPx, GPx-P, GSHPx-3, GSHPx-P, EGPx	+	+	+	+	+	+
Glutathione peroxidase 3b	GPx3b	+
Glutathione peroxidase 4a	GPx4, PHGPx, MCSP, snGPx, snPHGPx, mtPHGPx	+	+	+	+	+	+
Glutathione peroxidase 4b	GPx4b	+
Glutathione peroxidase 6	GPx6, OMP						+
Iodothyronine Deiodinase 1	Dio1, DI1, 5DI, TXDI1, ITDI1	+	+	+	+	+	+
Iodothyronine Deiodinase 2	Dio2, DI2, D2, 5DII, TXDI2, SelY	+	+	+	+	+	+
Iodothyronine Deiodinase 3a	Dio3, DI3, 5DIII, TXDI3	+	+	+	+	+	+
Iodothyronine Deiodinase 3b	Dio3b, DI3b	+
Methionine-R-Sulfoxide Reductase 1a	MsrB1, SelR, SelX, SepR,	+	+	+	+	+	+
Methionine-R-Sulfoxide Reductase 1b	MsrB1b	+
Selenophosphate Synthetase 2a	SPS2a, SEPHS2, Ysg3	+	+	+	+	+
Selenophosphate Synthetase 2b	SPS2b					+	+
Selenoprotein H	SelH, SepH	+	+	+	+	+	+
Selenoprotein I	SelI, SepI	+	+	+	+	+	+
Selenoprotein J	SelJ	+
Selenoprotein J2	SelJ2	+
Selenoprotein K	SelK, SelG, SepK	+	+	+	+	+	+
Selenoprotein L	SelL	+
Selenoprotein M	SelM, SepM	+	+	+	+	+	+
Selenoprotein N	SelN, SepN1, RSS, MDRS1, RSMD1	+	+	+	+	+	+
Selenoprotein O	SelO, SepO	+	+	+	+	+	+
Selenoprotein O2	SelO2	+
Selenoprotein P	SelP, SeP, SepP1, Se-P, SelPa	+	+	+	+	+	+
Selenoprotein Pb	SelPb	+		+	+	+
Selenoprotein S	SelS, VIMP, ADO15, SBBI8, SepS1, AD-015	+	+	+	+	+	+
Selenoprotein T1a	SelT1a, SepT	+	+	+	+	+	+
Selenoprotein T1b	SelT1b	+
Selenoprotein T2	SelT2	+
Selenoprotein U1a	SelU1, SepU1	+		+	+
Selenoprotein U1b	SelU1b, SepU1b	+
Selenoprotein U1c	SelU1c, SepU1c	+
Selenoprotein V	SelV, SepV						+
Selenoprotein W1	SelW1, SeW, SepW1	+	+	+	+	+	+
Selenoprotein W2a	SelW2a	+	+
Selenoprotein W2b	SelW2b	+
Selenoprotein W2c	SelW2c	+
Thioredoxin reductase 1	TR1, TxnRd1, TxnR, TrxR1, GRIM-12	+	+	+	+	+	+
Thioredoxin reductase 3	TR3, TR2, TxnRd2, SelZ, TrxR2, TR-Beta	+	+	+	+	+	+
Thioredoxin/glutathione reductase	TGR, TR2, TR3, TxnRd3, TrxR3		+	+	+	+	+

Selenoproteins detected by genomic searches in vertebrate genomes are shown. The groups for which a given selenoprotein was found in at least one organism are marked.