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Table 2 Identified plasma neurogranin peptides by high-resolution mass spectrometry a

From: Characterization of the postsynaptic protein neurogranin in paired cerebrospinal fluid and plasma samples from Alzheimer’s disease patients and healthy controls

Calculated mass (Da)

Theoretical mass (Da)

Deviation (ppm)

Confirmed sequence

Number of y-ions

Number of b-ions

1,899.98

1,899.98

−1.3

52 to 75b

1

11

2,203.24

2,203.24

1.7

43 to 65b

1

14

2,217.24

2,217.25

−1.8

44 to 67b

2

8

2,242.14

2,242.14

−0.1

49 to 75

5

12

2,329.18

2,329.17

1.0

48 to 75

10

20

2,373.34

2,373.35

−1.0

43 to 67b

0

6

2,570.36

2,570.35

1.8

46 to 75

10

17

2,698.45

2,698.45

0.1

45 to 75

12

19

2,826.54

2,826.54

−2.4

44 to 75

19

21

2,982.64

2,982.64

−1.7

43 to 75

21

8

3,053.69

3,053.68

2.9

42 to 75b

18

6

3,085.61

3,085.62

−4.3

44 to 78

6

12

3,184.73

3,184.72

2.7

41 to 75

14

4

3,241.72

3,241.73

−1.6

43 to 78

19

13

3,378.81

3,378.80

1.8

39 to 75b

8

2

3,534.91

3,534.90

1.7

38 to 75b

11

10

  1. aMass deviation is displayed in parts per million (ppm). bPeptides found only in plasma and not in cerebrospinal fluid or brain tissue.