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Related Concept Videos

Factors Influencing Attraction I: Proximity01:22

Factors Influencing Attraction I: Proximity

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Proximity plays a fundamental role in shaping interpersonal attraction by increasing opportunities for interaction and fostering familiarity. Research consistently demonstrates that individuals are more likely to form social bonds with those who are physically closer to them, whether in residential settings, workplaces, or educational institutions. This effect is largely driven by the increased frequency of encounters, which facilitates the development of friendships and romantic...
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In 1971, Peter Perlman and Eva Engvall developed an Enzyme-linked immunosorbent assay (ELISA or EIA). ELISA differs from western blot in that the assays are conducted in microtiter plates or in vivo rather than on an absorbent membrane.
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What do you think is the single most influential factor in determining with whom you become friends and whom you form romantic relationships? You might be surprised to learn that the answer is simple: the people with whom you have the most contact. This most important factor is proximity. You are more likely to be friends with people you have regular contact with. For example, there are decades of research that shows that you are more likely to become friends with people who live in your dorm,...
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DNA Topoisomerases02:02

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Topoisomerases are enzymes that relax overwound DNA molecules during various cell processes, including DNA replication and transcription. These enzymes regulate positive and negative DNA supercoiling without changing the nucleotide sequence. DNA overwinding in a clockwise direction results in positively supercoiled DNA, whereas underwinding in a counterclockwise direction produces negatively supercoiled DNA.
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One of the common DNA damages is the chemical alteration of single bases by alkylation, oxidation, or deamination. The altered bases cause mispairing and strand breakage during replication. This type of damage causes minimal change to the DNA double helix structure and can be repaired by the base excision repair (BER) pathways. BER corrects damaged DNA sequences by removing the damaged base and restoring the original base sequence using the complementary strand as a template.
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Related Experiment Video

Updated: Feb 5, 2026

Detection of Signaling Effector-Complexes Downstream of BMP4 Using in situ PLA, a Proximity Ligation Assay
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Proximity Ligation Assay (PLA).

Muhammad S Alam1

  • 1Laboratory of Immune Cell Biology, National Cancer Institute, National Institutes of Health, Bethesda, Maryland.

Current Protocols in Immunology
|September 22, 2018
PubMed
Summary
This summary is machine-generated.

Proximity ligation assay (PLA) detects protein-protein interactions in situ using antibody-linked DNA primers and fluorescent probes. This sensitive method allows visualization of molecular proximity in cells.

Keywords:
Duolink®antibodyin situ assaysprotein-protein interaction

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Cell Biology

Background:

  • Protein-protein interactions are crucial for cellular functions.
  • Detecting these interactions in situ at endogenous levels is challenging.
  • Existing methods may lack sensitivity or specificity.

Purpose of the Study:

  • To introduce and explain the Proximity Ligation Assay (PLA) technology.
  • To highlight PLA's capability for detecting protein-protein interactions in situ.
  • To emphasize PLA's sensitivity and specificity for endogenous protein analysis.

Main Methods:

  • Utilizes specific antibodies targeting two proteins of interest.
  • Antibodies are conjugated with DNA oligonucleotides.
  • Hybridization, DNA amplification, and fluorescent probe detection visualize proximity.

Main Results:

  • PLA enables detection of protein interactions at distances <40 nm.
  • The technique allows visualization of molecular proximity via fluorescence microscopy.
  • Demonstrates high sensitivity and specificity for protein interaction detection.

Conclusions:

  • Proximity Ligation Assay (PLA) is a simple and sensitive technique for studying protein-protein interactions.
  • PLA allows for in situ detection of interactions at endogenous protein levels.
  • PLA technology provides a powerful tool for molecular interaction studies in cells.