1.1 ,This guide defines terminology for description of cellular and/or tissue-based products (CTPs) for skin wounds. CTPs are defined primarily by their composition and comprise cells and/or the extracellular components of tissue. CTPs may contain cells (viable or nonviable), tissues, proteins, and other materials for which there is a rationale for benefit beyond that achievable with conventional wound coverings. CTPs may additionally include synthetic components. Whether an individual CTP is capable of promoting wound healing must be determined by adequate evidence and is beyond the scope of this standard.