<unk>  () is a<unk> otein that constitutes a<unk> ecursor for renin, the hormone that activates the renin–angiotensin system, which serves to raise blood<unk> essure.<unk>  is converted into renin by the juxtaglomerular cells, which are specialised smooth muscle cells<unk> esent mainly in the afferent, but also the efferent, arterioles of the glomerular capillary bed.<unk>  is a relatively large molecule, weighing approximately 46 KDa.
Prorenin
Renin
Orexin
Adrenalone
Angiotensin II 
Adrenomedullin
Adrenocortical hormone
Counterregulatory hormone