. 2015 Feb 26;361(3):733–744. doi: 10.1007/s00441-015-2133-8

Table 1.

Effect of phenylthiourea (PTU) on melanosome genesis in wild type melanophores

Treatment	Stage I + II^a / total	Stage III^a / total	Stage IV^a / total
Control^b	0 %	0 %	100 %
PTU^c	28.1 %*	69.8 %*	2.1 %*

*P < 0.001 (χ ² test)

^aPercentage of melanosomes at each stage among total melanosomes. Stage I and II melanosomes, partially melanized stage III melanosomes, and fully melanized stage IV melanosomes were according to the mammalian nomenclature of developing melanosomes (Raposo and Marks 2007)

^b721 melanosomes were counted in 6 different photographs of melanophores in the 18-day wild type regenerating tails in the absence of PTU (see Fig. 3a)

^c815 melanosomes were counted in 5 different photographs of melanophores in the 18-day wild type regenerating tails in the presence of PTU (see Fig. 3b)