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Ser-P, or phosphoserine, refers to the post-translational modification where a serine amino acid residue in a protein is covalently attached to a phosphate group.

The key points are:

- Serine (Ser or S) is one of the 20 standard amino acids found in proteins. [3][4]

- Phosphorylation of serine residues is a common post-translational modification that can alter the structure and function of proteins. [1][2]

- The phosphorylated form of serine is called phosphoserine or Ser-P. This modification is catalyzed by serine/threonine protein kinases. [1][2]

- Phosphorylation of serine residues is involved in regulating many cellular signaling pathways and processes, such as enzyme activity, protein-protein interactions, and subcellular localization. [1][2]

- Antibodies specific to phosphoserine can be used to detect and study proteins with phosphorylated serine residues. [1]

In summary, Ser-P refers to the phosphorylated form of the serine amino acid, which is a common post-translational modification that plays important regulatory roles in proteins and cellular processes. [1][2][3][4]