Recombinant protein not used in medical practice is

Options

A. Human growth hormone
B. Interferon ( `alpha , beta` and `gamma `)
C. Insulin
D. Heparin

Answer

To determine which recombinant protein is not used in medical practice from the given options, we will analyze each option based on their uses and whether they are recombinant proteins.

### Step 1: Understand Recombinant Proteins
Recombinant proteins are proteins that are produced from recombinant DNA technology. This involves combining DNA from different sources to produce a specific protein. These proteins often have therapeutic uses in medicine.

### Step 2: Analyze Each Option
1. **Human Growth Hormone (HGH)**:
- **Use**: Promotes growth and is used in medical practice for growth hormone deficiencies.
- **Type**: This is a recombinant protein.

2. **Interferon Alpha, Beta, and Gamma**:
- **Use**:
- Interferon Alpha is used to treat chronic hepatitis.
- Interferon Beta is used for treating multiple sclerosis.
- Interferon Gamma is a primary activator of macrophages.
- **Type**: All these interferons are recombinant proteins used in medical practice.

3. **Insulin**:
- **Use**: Used for the treatment of type 1 diabetes mellitus.
- **Type**: This is a recombinant protein.

4. **Heparin**:
- **Use**: Heparin is an anticoagulant (blood thinner) used in medical practice.
- **Type**: Heparin is not produced through recombinant DNA technology; it is synthesized through a complex metabolic pathway involving multiple enzymes.

### Step 3: Conclusion
From the analysis, we can conclude that **Heparin** is the recombinant protein that is not produced through recombinant DNA technology, even though it is used in medical practice. Therefore, the correct answer is:

**Heparin**