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Figure 3: Schematic of the cloud-based NGS analysis. Local computers allocate the cloud-based web services over the internet. Web services comprised a cluster of virtual machines (one master node and a chosen number of worker nodes). Input data are transferred to the cloud storage and the program code driving the computation is uploaded to master nodes, by which worker nodes are provisioned. Each worker node downloads reads from the storage and run computation independently. The final result is stored and meanwhile transferred to the local client computer and the job completes.