sentence: For example , we found protein targets involved with cell proliferation , differentiation , invasion and motility , such as protein kinase D ( gene id 5587 ) , protein kinase C ( gene id 5578 ) , polo-like kinase 1 ( gene id 5347 ) , steroidogenic factor 1 ( gene id 2516 ) and phosphatase regenerating liver-1 ( gene id 7803 ) [ 70 ] – [ 74 ] .