Answer
cDNA library only contains coding sequences, i.e., exons. Now, different types of cell will produce different proteins & will have different exon sequence. As a result, an organism will have different cDNA library for different cell types.
Work Step by Step
cDNA library only contains coding sequences, i.e., exons. Now, different types of cell will produce different proteins & will have different exon sequence. As a result, an organism will have different cDNA library for different cell types.