Heptapeptide-4 is a synthetic peptide composed of alanine, arginine, glutamic acid, glutamine and methionine. It smooths wrinkles through a mechanism similar to that of Botulinum toxin.

1. Myotropic activity and immunolocalization of selected neuropeptides of the burying beetle Nicrophorus vespilloides (Coleoptera: Silphidae)

2. Crystal Structure of BamB from Pseudomonas aeruginosa and Functional Evaluation of Its Conserved Structural Features

3. Extended exenatide administration enhances lipid metabolism and exacerbates pancreatic injury in mice on a high fat, high carbohydrate diet

4. Investigating Potential Interactions Between Neurohypophyseal Peptides, their Drug Analogs, and Coagulation Factor VIII

5. Emu oil in combination with other active ingredients for treating skin imperfections

A number of protein kinases have been implicated in the phosphorylation of the CTD during the transition from transcription initiation to elongation. Among these are the Cdk7 subunit of the GTF IIH (TFIIH) and the Cdk9 subunit of P-TEFb, a factor that regulates transcription elongation. The Cdk7 kinase phosphorylates serine 5 of the CTD heptapeptide motif. And, while the specificity of human P-TEFb remains controversial, a close yeast homologue of its Cdk9 subunit, Ctk1, modifies the serine residue at position 2 of the CTD heptapeptide repeat.

Mandal, S. S., Cho, H., Kim, S., Cabane, K., & Reinberg, D. (2002). FCP1, a phosphatase specific for the heptapeptide repeat of the largest subunit of RNA polymerase II, stimulates transcription elongation. Molecular and cellular biology, 22(21), 7543-7552.