Glossary



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  • Hematopoietic stem cells : The stem cells that give rise to all the blood cell types (red blood cell, white blood cell, platelets.
  • Hemizygote : A male patient with an X-linked disease. Since, being male he only has one X chromosome, if one of the genes on this chromosome is abnormal, he is hemizygote for this trait.
  • Heterodimer : Combination of the two molecules (dimer) which are different from each other (hetero).
  • Heterozygote : Person who for a given gene has one normal allele and one mutant allele and who is therefore a carrier.
  • Histology : Microscopic study of tissues in order to better understand their function and structure so as to be able to identify any eventual anomalies.
  • Homozygote : An individual who has two identical alleles of the gene for a given trait. They may have two 'good' genes or two 'bad' genes.
  • Hydrocephalus : Excessive cerebrospinal fluid build up around the brain ('water on the brain') with associated increase in intraventricular pressure.
  • Hyperpolarization : Changes in the cell membrane potential.
  • Hypertonia : Too much muscle tone leading to stiffness (Muscular hypertonia).
  • Hypomyelination : Lack of myelin.
  • Hypotonia : Loss of muscle tone.
  • Hypoxia : Deprivation of adequate oxygen supply.