18. Please select the appropriate primers to amplify only the coding region of the following gene EXCLUDING the stop codon.5' GCTCGATGGATCCAAACACTGTGTCAAGCTTTCAGGACATACTGCTGAGGATGTCAAAAATGC AGTTGGAGTCCTCATCGG AGGACTTGAATGGAATGATAACACAGTTCGAGTCTCTGAAACTCTACAGAGATTCGCTTGGAG AAGCAGTAATGAGAATGGGAG ACCTCCACTCACTCCAAAACAGAAACGAGAAATGGCGGGAACAATTAGGTCAGAAGTTTGA AGAAATAAGATGGTTGATTGAAG AAGTGAGACACAAACTGAAGATAACAGAGAATAGTTTTGAGCAAATAACATTTATGCAAGCC TTACATCTATTGCTTGAAGTGG AGCAAGAGATAAGAACTTTCTCGTTTCAGCTTATTTAG 3' (A)Primer 1: 5' GCTCGATGGATCCAAACACTGTGTC 3'; Primer 2: 5' CTTTCTCGTTTCAGCTTATTTAG 3' (B) Primer 1: 5' ATGGATCCAAACACTGTGTCAAGC 3'; Primer 2: 5' CTTTCTCGTTTCAGCTTATTTAG 3' (C) Primer 1: 5' GCTCGATGGATCCAAACACTGTGTC 3'; Primer 2: 5' CTAAATAAGCTGAAACGAGAAAGTTC 3' (D)Primer 1: 5' ATGGATCCAAACACTGTGTCAAGC 3'; Primer 2: 5' AATAAGCTGAAACGAGAAAGTTC 3'