The techniques herein relate to a blowout preventer a tubular of a wellbore penetrating a subterranean formation. The slider member comprises a pair of spaced-apart side walls and an intermediate body portion therebetween. The converting circuit is coupled to the card interface. The at least one actuated linkage has at least 7 degrees of movement freedom, enabling the serpentine robotic crawler to adopt a variety of poses. This high efficiency method can be used for the preparation of highly viable pooled human hepatocytes for experimentation to minimize individual variations.