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Isoelectric points for some proteins

Protein pI(-COOH) Protein(-NH3+) pI
α-Casein 4.1 Lysozyme 11.1
β-Casein 4.5 Myoglobin 7.0
γ-Casein 5.9 Myosin-A ~5.3
Collagen ~6.7 Ovalbumin 4.6
Cytochrome-c ~10.0 Pepsin ~1.0
Fibrinogen ~5.7 Rhodopsin 4.5
Haemoglobin (human) 7.1 Salmine 12.1
Insulin 5.4 Serum albumin 4.8
Taken from Pethig p.76