Cytologia 70(3): 283–286, 2005
نویسندگان
چکیده
Cytogenetics studies in 12 specimens of Gymnothorax ocellatus reveled a diploid chromosome number of 2n 42 (16 metacentrics, 18 submetacentrics and 8 acrocentrics). The nucleolar organizer regions were located in a terminal position on the long arm of the chromosome pair number fifteen. Conspicuous blocks of constitutive heterochromatin were observed in the centromeric and pericentromeric regions of some chromosome pairs. The results obtained are similar to those previously described for others species of this family. However, the cytogenetic informations may be useful in the identification of a possible variety of this species in Brazilian coast and contribute to the understanding of relationships among the species and the process of diversification which occurred in this group.
منابع مشابه
Mutagenesis of Thr-286 in monomeric Ca2+/calmodulin-dependent protein kinase II eliminates Ca2+/calmodulin-independent activity.
We have examined the role of Thr-286 autophosphorylation in the autoregulation of Ca2+/calmodulin-dependent protein kinase II. Using site-directed mutagenesis, we have substituted alanine or serine for Thr-286, or isoleucine for Arg-283, in the 50-kDa subunit of the kinase and expressed each protein in bacteria. Activation and autophosphorylation of all four enzymes were stringently dependent o...
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