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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 

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Somatomedin A levels in serum from healthy children and from children with growth hormone deficiency or delayed puberty.

Serum somatomedin A ( SMA) has been determined in healthy children (n = 188) in relation to age using both a radioimmunoassay and a radioreceptor assay. The SMA levels, only 50% of adult values at birth, rise gradually with age and reach adult levels at 10 years of age. There is a significant correlation (r = 0.46 P less than 0.001) between SMA determined by the two methods throughout childhood except during puberty. Immunoreactive SMA shows a marked pubertal rise in values with a peak 2 years earlier for girls than boys, which is not observed by the radioreceptor assay technique. In boys with delayed puberty the increase in immunoreactive SMA is seen first when the testes reach a size of 5 ml. Children with growth hormone deficiency (n = 30) had significantly lower levels of SMA than health age-matched controls. Immunoreactive SMA gives a better separation of these groups than the values obtained by radioreceptor assay.[1]

References

  1. Somatomedin A levels in serum from healthy children and from children with growth hormone deficiency or delayed puberty. Hall, K., Enberg, G., Ritzén, M., Svan, H., Fryklund, L., Takano, K. Acta Endocrinol. (1980) [Pubmed]
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