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    A nitrogen-containing, double-ring, basic compound that occurs in nucleic acids. The pyrimidines in DNA are cytosine and thymine; in RNA, cytosine and uracil.


One of the pyrimidine nitrogenous bases occurring in both DNA and RNA.

A nitrogenous base, one member of the base pair AT (adenine-thymine).

Ribonucleic acid. A long-chain, usually single-stranded. The primary function of RNA is protein synthesis within a cell. However, RNA is involved in various ways in the processes of expression and repression of hereditary information. The three main functionally distinct varieties of RNA molecules are: (1) messenger RNA (mRNA) which is involved in the transmission of DNA information, (2) ribosomal RNa (rRNA) which makes up the physical machinery of the synthetic process, and (3) transfer RNA (tRNA) which also constitutes another functional part of the machinery of protein synthesis.

A nitrogenous base normally found in RNA but not DNA; uracil is capable of forming a base pair with adenine.


Pyridamal 100
Pyridamal 100 is a prescription or over-the-counter drug which is (or once was) approved in the United States and possibly in other countries. Active ingredient(s): chlorpheniramine maleate.

Pyridostigmine bromide
Pyridostigmine bromide is a prescription or over-the-counter drug which is (or once was) approved in the United States and possibly in other countries. Active ingredient(s): pyridostigmine bromide.

Vitamin B6, sometimes used to treat nausea in pregnancy or to manage premenstrual syndrome symptoms.

Pyridoxine hcl
Pyridoxine hcl is a prescription or over-the-counter drug which is (or once was) approved in the United States and possibly in other countries. Active ingredient(s): pyridoxine hydrochloride.

Pyrilamine maleate
Pyrilamine maleate is a prescription or over-the-counter drug which is (or once was) approved in the United States and possibly in other countries. Active ingredient(s): pyrilamine maleate.


Any of a group of complex organic compounds which contain carbon, hydrogen, oxygen, nitrogen, and usually sulfur, the characteristic element being nitrogen. Proteins, the principal constituents of the protoplasm of all cells, are of high molecular weight and consist essentially of combinations of a-amino acids in peptide linkages. Twenty different amino acids are commonly found in proteins, and each protein has a unique genetically defined amino acid sequence which determines its specific shape and function. Their roles include enzymatic catalysis, transport and storage, coordinated motion, nerve impulse generation and many others.

A sequence of events by which a child becomes a young adult; characterized by secretions of hormones, development of secondary sexual characteristics, reproductive functions, and growth spurts.

The expression of the genes present in an individual. This may be directly observable (eye color) or apparent only with specific tests (blood type). Some phenotypes such as the blood groups are completely determined by heredity, while others are readily altered by environmental agents.

Long chains of nucleotides formed by chemical links between the sugar and phosphate groups.


Polymerase Chain Reaction (PCR)
PCR. A method for amplifying a DNA base sequence using a heat-stable polymerase and two 20-base primers, one complementary to the (+) strand at one end of the sequence to be amplified and one complementary to the (-) strand at the other end. Because the newly synthesized DNA strands can subsequently serve as additional templates for the same primer sequences, successive rounds of primer annealing, strand elongation, and dissociation produce rapid and highly specific amplification of the desired sequence. PCR also can be used to detect the existence of the defined sequence in a DNA sample.

Putative father
Males alleged or reputed to be biological fathers of illegitimate children.

The gland located within the brain that synthesizes melatonin.

The gland from which a number of hormones are released into the bloodstream. These hormones include growth hormone, ACTH, B-lipocortin (the precursor to B-endorphorin), FSH, LH, and TSH.

A hormone produced in response to luteinizing hormone (LH) released from the pituitary gland. It is required to flush out the uterus if an egg is not fertilized. It is also useful for stimulating the growth of new bone mass.

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