Buscar recursos académicos

Human blastocyst-derived, pluripotent cell lines are described that have normal karyotypes, express high levels of telomerase activity, and express cell surface markers that characterize primate embryonic stem cells but ...

Materias / palabras clave: Embryology, Human; Embriología humana

We describe a series of stages for development of the embryo of the zebrafish, Danio (Brachydanio) rerio. We define seven broad periods of embryogenesis--the zygote, cleavage, blastula, gastrula, segmentation, pharyngula...

Materias / palabras clave: Embryology; Embriología; Embryonic Development; Desarrollo embrionario; Birds; Aves

Materias / palabras clave: Células germinales; Investigación; Embrión humano; Aspectos éticos; Aspectos jurídicos; Germ cells; Human embryo; Research; Moral and ethical aspects

The process of programmed cell death, or apoptosis, is generally characterized by distinct morphological characteristics and energy-dependent biochemical mechanisms. Apoptosis is considered a vital component of various p...

Somatic cell nuclear transfer allows trans-acting factors present in the mammalian oocyte to reprogram somatic cell nuclei to an undifferentiated state. We show that four factors (OCT4, SOX2, NANOG, and LIN28) are suffic...

We have designed a system for targeted gene expression that allows the selective activation of any cloned gene in a wide variety of tissue- and cell-specific patterns. The gene encoding the yeast transcriptional activato...