SHC1 (SHC Adaptor Protein 1): SHC1 is a protein that plays a crucial role in cellular signalling by acting as an adaptor in pathways regulating cell growth, differentiation, and survival. It mediates the activation of the Ras/MAPK signalling pathway, influencing how cells respond to growth factors and cytokines. Dysregulation of SHC1 has been linked to the development of various cancers and cardiovascular diseases, emphasising its important role in cell signalling and disease progression.