What is the term used for the foreign gene when it is expressed in a host cell?

Step-by-step solution

After having cloned the gene of interest and having optimized the conditions to induce the expression of the target protein, one has to consider producing it on a large scale. If any protein encoding gene is expressed in a heterologous host, it is called a recombinant protein . The cells harbouring cloned genes of interest may be grown on a small scale in the laboratory. The cultures may be used for extracting the desired protein and then purifying it by using different separation techniques