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Table 2 Types of H-bond involving water and their numbers: W–SC water–side chain, W–W water–water

From: Ultra-high resolution X-ray structures of two forms of human recombinant insulin at 100 K

Type of H-bond W–SC, W–W

0,1

0,2

0,3

0,4

0,5

1,0

1,1

1,2

1,3

1,4

2,0

2,1

2,2

2,3

Number N

18

19

6

3

1

24

18

27

6

2

7

14

6

6

Type of H-bond W–SC, W–W

3,0

3,1

3,2

3,3

3,4

4,0

4,1

4,2

4,3

5,0

5,1

6,0

7,0

Number N

8

6

6

2

2

2

6

2

1

1

2

1

1

  1. Eg 3,3 N = 2 (italicized) means that 2 water molecules have a total of 3 hydrogen bonds to side chain atoms plus 3 hydrogen bonds to another water molecule (6 hydrogen bonds in total)