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