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Diadenosine tetraphosphate or Ap4A is a putative alarmone, ubiquitous in nature being common to everything from bacteria to humans. Adenosine polyphosphates are capable of inducing multiple physiological effects. The molecule's role as a second messenger has recently been discovered in The LysRS-Ap4A-MITF signaling pathway.
References
Ap4A Wikipedia(Text) CC BY-SA