Indicate whether each of the following descriptions better applies to cDNA libraries (C) or genomic DNA libraries (G). Your answer would be a five-letter string composed of letters C and G only, e.g. CGCGC.
( ) Their production requires use of reverse transcriptase.
( ) They are enriched in protein-coding genes.
( ) Different sequences are represented in them based on their transcription level.
( ) They contain intronic sequences.
( ) They are cell-type specific.