Beans, black, mature seeds, cooked, boiled, without salt

Grams of protein per 100 grams of food: 8.86
Percentage protein (of total Calories): 27.0

Amino Acid Percentage Score
Tryptophan 1.19 1.69
Threonine 4.21 1.56
Isoleucine 4.41 1.77
Leucine 7.99 1.45
Lysine 6.86 1.35
Valine 5.24 1.64
Arginine 6.20 3.44
Methionine+Cystine 2.58 1.03
Phenylalanine+Tyrosine 8.23 1.75

Percentage: Amino acid amount divided by total protein amount.
Score: Amino acid percentage divided by ideal value for this amino acid

See This article about complete protein for more information.