41. In budding yeast, CAK is a monomeric protein kinase and is referred to as Cak1. 42. The protein encoded by this gene is a member of serine / threonine protein kinase family. 43. Others blocked protein kinase C, an enzyme which may orchestrate the depolarization from within the cell. 44. Thrombin binding to its receptor activates protein kinase C and increases the level of inositol triphosphate. 45. B-Raf is a serine / threonine-specific protein kinase . 46. It is a calcium-independent and phospholipid-dependent protein kinase . 47. The most understood mechanisms include phosphorylation by the second messenger protein kinase C ( PKC ). 48. Tyrosine kinases are a subclass of protein kinase . 49. Influenza A virus also blocks protein kinase R activation and the establishment of the antiviral state. 50. It is a protein kinase C inhibitor.