Association of oocytes with supporting epithelial granulosa cells to form primordial follicles.

A structure in the head of a spermatozoon that contains acid hydrolases, and is concerned with the breakdown of the outer membrane of the ovum during fertilization. It lies just beneath the plasma membrane and is derived from the lysosome.

Catalysis of the reaction: CMP-N-acetylneuraminate + glycano-(1->3)-(N-acetyl-alpha-D-galactosaminyl)-glycoprotein = CMP + glycano-[(2->6)-alpha-N-acetylneuraminyl]-(N-acetyl-D-galactosaminyl)-glycoprotein.

An acute behavioral change resulting from a perceived external threat.

The response of an organism to a perceived external threat.

A behavioral response seeking to protect an organism from an a perceived external threat to that organism.

The heat generation process that results in a rise in body temperature above the normal, often as a response to infection.

An acute inflammatory response that involves non-antibody proteins whose concentrations in the plasma increase in response to infection or injury of homeothermic animals.

Any homeostatic process in which an organism produces heat, thereby raising its internal temperature.

A conditioned aversion to a specific chemical compound as a result of that compound being coupled with a noxious stimulus.

The process whose specific outcome is the progression of the ureteric bud over time, from its formation to the mature structure.

The progression of a mesonephric tubule over time, from its initial formation to the mature structure. A mesonephric tubule is an epithelial tube that is part of the mesonephros.

The process in which the branching structure of the ureteric bud is generated and organized. The ureteric bud is an epithelial tube that grows out from the metanephric duct. The bud elongates and branches to give rise to the ureter and kidney collecting tubules.

The process whose specific outcome is the progression of the urogenital system over time, from its formation to the mature structure.

The process whose specific outcome is the progression of the metanephros over time, from its formation to the mature structure. In mammals, the metanephros is the excretory organ of the fetus, which develops into the mature kidney and is formed from the rear portion of the nephrogenic cord. The metanephros is an endocrine and metabolic organ that filters the blood and excretes the end products of body metabolism in the form of urine.

Combining with an extracellular or intracellular peptide to initiate a change in cell activity.

A structure found in the nucleolus, which contains newly synthesized preribosomal RNA (pre-rRNA) and a collection of proteins.

A structure found in the nucleolus, which contains nearly completed preribosomal particles destined for the cytoplasm.