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Related Concept Videos

Whole Body Regeneration01:33

Whole Body Regeneration

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Regeneration is the process of restoring injured or lost tissues, organs, or body parts. While simpler organisms generally show greater ability to regenerate their whole body, few complex animals show similarly exceptional regeneration. For example, planarian flatworms have a unique regenerative potential making them a popular study organism among biologists to understand the mechanisms of whole body regeneration. Other organisms, such as hydra, also show extreme regeneration potential;...
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Overview of Regeneration and Repair01:19

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Regeneration and repair processes are critical in healing damages caused by injury, disease, and aging. In regeneration, the damaged tissue is entirely replaced with new growth that restores the original architecture and function. In contrast, tissue repair usually results in a fixed tissue architecture involving scar formation. Scars generally do not reestablish tissue function and may also exhibit structural abnormalities at the injury site.
Regeneration
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Zygotic Development And Stem Cell Formation01:10

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The development of all multicellular organisms starts with the fusion of haploid cells called sperm and egg to form a diploid zygote. A zygote is a totipotent cell that can develop into a complete organism. The zygote undergoes cell division or cleavage to form an 8-cell mass. Until this stage, the cells are spherical, loosely attached, and remain totipotent. Totipotent cells are capable of developing both the embryonic and the extraembryonic tissues. However, as they continue to divide, they...
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Liver Regeneration01:24

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The liver is an important organ in vertebrates that plays an essential role in metabolism. It is also responsible for storing and redistributing nutrients such as carbohydrates, fats, and vitamins in the body. Additionally, the liver releases bile salts which are critical for digesting food and eliminating toxic metabolites from the body.
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Neurogenesis and Regeneration of Nervous Tissue01:15

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In the CNS, neurogenesis, the birth of new neurons from stem cells, is limited to the hippocampus in adults. In other regions of the brain and spinal cord, neurogenesis is almost non-existent due to inhibitory influences from neuroglia, especially oligodendrocytes, and the absence of growth-stimulating cues. The myelin produced by oligodendrocytes in the CNS inhibits neuronal regeneration. Furthermore, astrocytes proliferate rapidly after neuronal damage, forming scar tissue that physically...
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After cellular or tissue damage, the resident stem cells present in the human body can locally repair and regenerate the damaged tissue or organ. However, even though some tissues do not have stem cells, they can repair and regenerate with the help of pre-existing cells. For example, beta cells of the pancreas and hepatocytes of the liver can divide to renew and regenerate the tissue. Here, both cell division and cell death are well regulated by homeostasis.
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Updated: Nov 23, 2025

Visualizing Cytoplasmic Flow During Single-cell Wound Healing in Stentor coeruleus
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Shoot Regeneration Is Not a Single Cell Event.

Patharajan Subban1, Yaarit Kutsher1, Dalia Evenor1

  • 1Institute of Plant Sciences, ARO Volcani Center, P.O. Box 15159, Rishon LeZion 7528809, Israel.

Plants (Basel, Switzerland)
|January 1, 2021
PubMed
Summary
This summary is machine-generated.

Plant shoot regeneration requires a crucial 4-5 day induction period on regeneration medium. Early molecular events are complex, with regeneration originating from a cell group, not a single cell.

Keywords:
regeneration inductionshoot regenerationtobacco

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Area of Science:

  • Plant Biotechnology
  • Molecular Genetics
  • Developmental Biology

Background:

  • Shoot regeneration is vital in plant biotechnology but poorly understood at the molecular level.
  • Early signaling events and genetic factors governing shoot regeneration remain largely unknown.

Purpose of the Study:

  • To investigate the critical time frame for shoot regeneration induction in tobacco.
  • To identify early molecular and genetic changes during shoot regeneration.

Main Methods:

  • Incubation of tobacco leaf segments on regeneration medium for varying durations.
  • Analysis of gene expression patterns during the initial days of regeneration.

Main Results:

  • A critical 4-5 day induction period on regeneration medium is essential for shoot regeneration.
  • Gene expression analysis revealed complex changes without a single dominant pattern.
  • Regeneration initiates from a group of cells, forming primordia not identifiable in early stages.

Conclusions:

  • The initial 4-5 days are crucial for inducing shoot regeneration capacity.
  • Early molecular events are intricate, involving diverse gene families and cell cycle regulators.
  • Shoot regeneration originates from multiple cells, not a single cell, with primordia developing later.