A precursor to this group of compounds is present in the endosperm of germinating seeds, and moves to the root tip after germinating to stimulate mitosis.  
A precursor to this group of compounds is present in the endosperm of germinating seeds, and moves to the root tip after germinating to stimulate mitosis.  Working by binding to a receptor protein to the plasma membrane of a cell, Zeatin moves into the nucleus and activates several nuclear transcription factors, which produces mass quantities of mRNA.  Derived from adenine, some other functions these compounds are involved in are differentiation root tissue, differentiation of the meristem, leaf formation, and the development of chloroplasts from etioplasts.  FTP, name these plant hormones, which, unlike auxins, cause growth rather than elongation, and take their name from their role in stimulating cell division.
A precursor to this group of compounds is present in the endosperm of germinating seeds, and moves to the root tip after germinating to stimulate mitosis.  
cytokinins