#samtools merge merged.bam in.1.bam in.2.bam
mv VK3R18_UAPC3.bam VK3R18_UAPC3a.bam 
samtools merge VK3R18_UAPC3.bam  VK3R18_UAPC3b.bam  VK3R18_UAPC3a.bam
mv VK3R19_GAPC1.bam VK3R19_GAPC1a.bam 
samtools merge VK3R19_GAPC1.bam  VK3R19_GAPC1b.bam  VK3R19_GAPC1a.bam
mv VK3R20_GAPC2.bam VK3R20_GAPC2a.bam 
samtools merge VK3R20_GAPC2.bam  VK3R20_GAPC2b.bam  VK3R20_GAPC2a.bam
mv VK3R21_GAPC3.bam VK3R21_GAPC3a.bam 
samtools merge VK3R21_GAPC3.bam  VK3R21_GAPC3b.bam  VK3R21_GAPC3a.bam
mv VK3R22_TAPC1.bam VK3R22_TAPC1a.bam 
samtools merge VK3R22_TAPC1.bam  VK3R22_TAPC1b.bam  VK3R22_TAPC1a.bam
mv VK3R23_TAPC2.bam VK3R23_TAPC2a.bam 
samtools merge VK3R23_TAPC2.bam  VK3R23_TAPC2b.bam  VK3R23_TAPC2a.bam
mv VK3R24_TAPC3.bam VK3R24_TAPC3a.bam 
samtools merge VK3R24_TAPC3.bam  VK3R24_TAPC3b.bam  VK3R24_TAPC3a.bam