Courtesy of Rick Hall, About.com Nutrition Guide nutrition.about.com

Nutrient	Units	1 cup, chopped  ------- 88.000 g
Proximates
Water	g	79.807
Energy	kcal	24.640
Energy	kj	102.960
Protein	g	2.622
Total lipid (fat)	g	0.308
Carbohydrate, by difference	g	4.611
Fiber, total dietary	g	2.640
Ash	g	0.810
Minerals
Calcium, Ca	mg	42.240
Iron, Fe	mg	0.774
Magnesium, Mg	mg	22.000
Phosphorus, P	mg	58.080
Potassium, K	mg	286.000
Sodium, Na	mg	23.760
Zinc, Zn	mg	0.352
Copper, Cu	mg	0.040
Manganese, Mn	mg	0.202
Selenium, Se	mcg	2.640
Vitamins
Vitamin C, ascorbic acid	mg	82.016
Thiamin	mg	0.057
Riboflavin	mg	0.105
Niacin	mg	0.561
Pantothenic acid	mg	0.471
Vitamin B-6	mg	0.140
Folate	mcg	62.480
Vitamin B-12	mcg	0.000
Vitamin A, IU	IU	1356.960
Vitamin A, RE	mcg_RE	135.520
Vitamin E	mg_ATE	1.461
Lipids
Fatty acids, saturated	g	0.048
4:0	g	0.000
6:0	g	0.000
8:0	g	0.000
10:0	g	0.000
12:0	g	0.000
14:0	g	0.000
16:0	g	0.041
18:0	g	0.006
Fatty acids, monounsaturated	g	0.021
16:1	g	0.000
18:1	g	0.021
20:1	g	0.000
22:1	g	0.000
Fatty acids, polyunsaturated	g	0.147
18:2	g	0.033
18:3	g	0.114
18:4	g	0.000
20:4	g	0.000
20:5	g	0.000
22:5	g	0.000
22:6	g	0.000
Cholesterol	mg	0.000
Amino acids
Tryptophan	g	0.026
Threonine	g	0.080
Isoleucine	g	0.096
Leucine	g	0.115
Lysine	g	0.124
Methionine	g	0.030
Cystine	g	0.018
Phenylalanine	g	0.074
Tyrosine	g	0.055
Valine	g	0.113
Arginine	g	0.128
Histidine	g	0.044
Alanine	g	0.104
Aspartic acid	g	0.187
Glutamic acid	g	0.330
Glycine	g	0.084
Proline	g	0.100
Serine	g	0.088

USDA Nutrient Database for Standard Reference, Release 12 (March 1998)