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Protein Protocols Protein Protocols

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Fractionated Extraction 153<br />

Fig. 2. 2-DE protein patterns from mouse liver. The tissue was fractionated in to supernatant<br />

I + II (A), pellet extract (B), and pellet suspension (C) as described in Subheading 3. The three<br />

fractions were subjected to the large gel 2-DE (3). In pattern and vice versa. Pellet specific<br />

spots occur more in the basic half, and supernatant-specific spots more in the acid half of the<br />

pattern. The pellet suspension reveals the very basic protein of the tissue extracts. Because the<br />

IEF gels do not cover the entire basic pH range, these proteins cannot reach their isoelectric<br />

points. To prevent these proteins from accumulating at the end of the gels, the IEF run was<br />

shortened by 2 h at 1000 V. Consequently, the very basic proteins form streaks instead of focused<br />

spots. For the evaluation of the patterns in terms of number of spots, see Notes 1 and 2.

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