Undifferentiated purposes

Note that chemicals that have some uses that are covered by TSCA and some that are covered by FIFRA or the FFDCA are subject to TSCA 8(e) reporting when manufactured for undifferentiated purposes and when used for TSCA-covered purposes. 

Meristem culture aseptic culture of shoot meristems or other explant tissues on nutrient media for the purpose of growing whole plants. Plant meristems are centers of mitotic cell division. They are composed of a group of undifferentiated self-renewing stem cells from which most plant structures originate to form the mature bodies of vascular plants. Meristem culture has been used widely in horticulture (63). 

Late markers are not shared by undifferentiated neuroepithelial cells in their resident or itinerant status, and often not even after neuroblasts settle in their stable niche, but only after they become functional and mature neurons, with regard to the biosynthesis of neurotransmitters, resting membrane potential, membrane receptors, and synaptic contacts. The start of those markers expression should be kept in mind not only with reference to brain sections from the fetal to the neonatal stage but also, with particular attention, when the same tissues are used as starting material for growing cell cultures. For this purpose. Table 1 summarizes the most useful and predictive immunocytochemical markers found in the course of neuronal differentiation. 

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