Glossary beginning with P

PARsearch for term
Proteins required for polarity and partitioning molecules to different regions of a cell, several of which are themselves partitioned, e.g. PAR-2.
pharmacological treatmentssearch for term
The applications of substances, such as drugs, that cause specific effects on cellular processes.
phenotypesearch for term
An observable characteristic of an organism that arises from environmental factors, or a combination of environmental and genetic (genotype) factors. Organisms with the same genotype can have very different phenotypes. Synonyms: phenotypes
pinhole aperturesearch for term
A device used in confocal microscopy to control the amount of light admitted to the detector. This allows for a clearer image by preventing out-of-focus light from reaching the detector.
polaritysearch for term
Presence of functional and/or structural differences in distinct regions of a cell or cellular component along a defined axis.
pro-nuclei meetingsearch for term
The developmental stage where pro-nuclei that are migrating from opposite ends of the fertilized zygote meet.
pro-nucleussearch for term
One of two haploid nuclei in a newly fertilized embryo (one maternal and one paternal) (adapted from The Cell A Molecular Approach. Geoffrey M. Cooper 1997) Synonyms: pro-nuclei
progenysearch for term
Offspring; the immediate descendants of an organism.
prokaryotesearch for term
Class of organisms, including the eubacteria and archaea, that lack a true membrane-limited nucleus and other organelles. (Molecular Cell Biology/Harvey Lodish [et al.] - 4th) Synonyms: prokarya, prokaryotes, prokaryotic organisms
proliferationsearch for term
Increase in the number of cells or offspring.
proteinsearch for term
A linear polymer of amino acids linked together in a specific sequence and usually containing more than 50 residues. Proteins form the key structural elements in cells and participate in nearly all cellular activities.