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Table 2 Grouping compounds into equivalence classes clarifies their nutrient roles

From: Computing minimal nutrient sets from metabolic networks via linear constraint solving

Class

Element(s)

Compounds

1

C

alpha-D-glucose, glycerol, D-mannose, D-glucarate, and 27 others

2

C, P

beta-D-glucose-6-phosphate,alpha-D-glucose-1-phosphate, 2 others

3

C, N

N-acetyl-beta-D-glucosamine, L-serine, adenosine, and 7 others

4

C, N

L-alanine, D-alanine, and 2 others

5

C, N

glycylproline

6

C

(R)-malate

7

C

acetoacetate

8

C

fumarate

9

C

2-oxoglutarate

10

C

acetate

11

C

formate

12

C

(S)-lactate

13

C

succinate

14

C, N

ethanolamine

15

C, N

L-proline

16

C, N

L-glutamine

17

C, N

L-glutamate

18

N

ammonium

19

C, P

sn-glycerol-3-phosphate

20

P

phosphate

21

S

sulfate

  1. The equivalence classes of compounds generated from our original minimal nutrient sets are shown here. All the compounds in an equivalence class are interchangeable in their roles in predicted minimal nutrient sets. For example, alpha-D-glucose (class 1) can substitute for glycerol, D-mannose, and so forth. Column one shows the class’ number, column two shows the elements that we believe it provides as part of predicted minimal nutrient sets, and column three lists all or a representative part of the compounds contained within the class.