In a recent paper in PNAS, Rigoutsos et al. (2006) describe a nonrandom pattern of repeated elements, called pyknons, which are found more frequently in the 3' untranslated regions of genes than in other regions of the human genome. Although it is unclear how pyknons might have arisen, it is possible that they may be involved in a new form of gene regulation.

scapes or metropolitan regions. The Organization for Economic Cooperation and Development (OECD) defines governance today as “the organization and administration of regional authorities and institutions on the most varied levels as well as the corresponding processes of decision-making, cooperation, and exertion of influence” (OECD 2001). But, as most observers of politico-institutional develop...

The distribution of the species Xenogenus Berg in Chile is addressed. known gracilis (Reed), previously restricted to O’Higgins region (besides Argentina, Bolivia, Brazil and Peru), expanded up Tarapacá Los Ríos regions. picturatum (previously from Cuba, Mexico, Nicaragua, Uruguay USA including Puerto Rico) recorded for first time Chile, Metropolitan Maule regions

OBJECTIVES The BRAZOS (The Brazilian Osteoporosis Study) study is the first epidemiological and population-based study carried out in a representative sample of Brazilian men and women, 40 years or older, with the objective of identifying the prevalence and main clinical risk factors (CRF) associated with low-impact fractures. This report shows the main results according to each region of the c...