Epidermal cells PyroE-E-D-S-GOH and PyroE-GOH 1
Colon Endothelial cells PyroE-H-GOH  1
Hepatocytes PyroE-Q-S-G-DNH2, PyroE-Q-S-G-DOH, Pyro-E-E-S-G-DNH2,PyroE-E-S-G-DOH. 1
Melanocytes PyroE-F-GNH2                                                 1
T-Lymfocytes AcE-S-GNH2 1
Neuroblast cells AcD-Q-Y-GNH2  
Hemoregulatory peptides Pyro-E-E-D-C-KOH AcS-D-K-POH]. 7 8
Thymus factors pyroE-A-E-S-N; PyroE-A-G-G-S-E-D PyroE-A-G-E-E-S-N 9
Seminal plasma PyroE-A-E-S-A PyroE-V-A-D-S-D-Q-N 10
PyroE = pyroglutamic acid.
Table 1: Isolated low MW growth inhibitors of chalonic nature.