Final answer:
Albumin and globulin are present in serum, while fibrinogen is absent.
Explanation:
Albumin and globulin are present in serum, while fibrinogen is absent. Albumin is the most abundant plasma protein, essential for maintaining blood volume and pressure, while globulins play a role in transporting substances and immunity. On the other hand, fibrinogen is crucial for blood clotting but is not found in serum as it is involved in the clotting process.
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