SP2 (Specificity Protein 2) and SP3 (Specificity Protein 3) are also members of the Sp/KLF (Sp1/Krüppel-like factor) family of transcription factors, similar to SP1. They share some functional similarities but also have distinct roles in cellular processes and cancer biology.
-Sp proteins are a family of transcription factors that play a crucial role in regulating gene expression.
-SP1 is often overexpressed in various types of cancer, including breast, prostate, and lung cancers. However, expression levels of Sp in normal cells and tissues are low to undetectable.