Caenorhabditis elegans	-	706445	
Cavia porcellus	guinea pig	390760	
Escherichia coli	K12	390748, 390749, 390750	
Euglena gracilis	-	763623	
Gossypium hirsutum	isoform ECR1	699263	
Gossypium hirsutum	isoform ECR2	699263	
Homo sapiens	-	390760, 656193, 740717, 740725	
Homo sapiens	expression in Escherichia coli fused to maltose-binding protein	673644	
Mus musculus	-	390760, 656193	
Mycobacterium tuberculosis	-	657270, 687289	
Phalaenopsis amabilis	-	726112	
Rattus norvegicus	-	740376	
Rattus norvegicus	no information in the literature concerning reduction of cis-2-enoyl-CoA substrates, thus classification of rat enzyme according to EC 1.3.1.8 or EC 1.3.1.38 not yet possible	390751, 390752, 390753, 390754, 390755, 390756, 390757, 390758, 390759	
Streptomyces collinus	-	390761