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Auricles Chemosensory organs usually located on the lateral anterior margin of the planarian head. 
Blastema A group of proliferating and differentiating cells that coalesce at a wound to give rise to a new body part. 
Ectoderm The outermost of the three primary germ layers of an embryo; forms the epidermis and nervous system. 
Endoderm The innermost of the three primary germ layers of an embryo; forms the gut and associated structures. 
Mesoderm The middle of the three primary germ layers of an embryo; forms several structures, such as the connective tissue and the excretory system. 
Polarity The asymmetric distribution of specific features in a cell, tissue, or organism that determines axial and/or spatial orientation. 
Protonephridia The excretory system of the worms. Like the kidney, it is a system of branching tubules that maintain the osmoregulatory balance of the body. Each protonephridia is a single unit of the system composed of a multiciliated flame cell, connected to an epithelial duct (tube) that opens externally through pores in the animal's epidermis. 
Remodeling The reorganization of cells and tissues in the preexisting tissue of a regenerating fragment that ultimately reestablishes proper body proportions in the new animal. 
Riboprobe Fragment of RNA, synthesized in vitro, whose nucleotide sequence is complementary to the target mRNA. The nucleotides of the riboprobe are specifically labeled with small molecules (e.g., digoxigenin, dinitrophenol, or fluorescein) for the riboprobe detection and localization in cells and tissues. 
RNAi A technique that uses double-stranded RNA molecules to inhibit the expression of a specific gene, and thus examines the effect of its absence. 
Stem cell An undifferentiated cell that is capable of dividing and giving rise to more stem cells and to differentiated, tissue-specific cell types. 
Totipotent cell A cell with the potential to give rise to all the cell types of the body and extra-embryonic tissues. 
Transcriptome The sum of all RNA molecules expressed in a cell, tissue, organ, or organism in a specific moment and condition. 
Auricles Chemosensory organs usually located on the lateral anterior margin of the planarian head. 
Blastema A group of proliferating and differentiating cells that coalesce at a wound to give rise to a new body part. 
Ectoderm The outermost of the three primary germ layers of an embryo; forms the epidermis and nervous system. 
Endoderm The innermost of the three primary germ layers of an embryo; forms the gut and associated structures. 
Mesoderm The middle of the three primary germ layers of an embryo; forms several structures, such as the connective tissue and the excretory system. 
Polarity The asymmetric distribution of specific features in a cell, tissue, or organism that determines axial and/or spatial orientation. 
Protonephridia The excretory system of the worms. Like the kidney, it is a system of branching tubules that maintain the osmoregulatory balance of the body. Each protonephridia is a single unit of the system composed of a multiciliated flame cell, connected to an epithelial duct (tube) that opens externally through pores in the animal's epidermis. 
Remodeling The reorganization of cells and tissues in the preexisting tissue of a regenerating fragment that ultimately reestablishes proper body proportions in the new animal. 
Riboprobe Fragment of RNA, synthesized in vitro, whose nucleotide sequence is complementary to the target mRNA. The nucleotides of the riboprobe are specifically labeled with small molecules (e.g., digoxigenin, dinitrophenol, or fluorescein) for the riboprobe detection and localization in cells and tissues. 
RNAi A technique that uses double-stranded RNA molecules to inhibit the expression of a specific gene, and thus examines the effect of its absence. 
Stem cell An undifferentiated cell that is capable of dividing and giving rise to more stem cells and to differentiated, tissue-specific cell types. 
Totipotent cell A cell with the potential to give rise to all the cell types of the body and extra-embryonic tissues. 
Transcriptome The sum of all RNA molecules expressed in a cell, tissue, organ, or organism in a specific moment and condition. 
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