Tetrad

Four homologous chromatids in a bundle in the first meiotic prophase and metaphase. The meiotic configuration of four chromatids first seen in pachytene. There is one tetrad per pair (bivalent) of homologous chromosomes. The four haploid product cells from a single meiosis.

Spliceosome

Protein-RNA complex that removes introns from eukaryotic nuclear RNAs.

Proteins

Amino acid polymers with specific biological functions, especially the growth, regeneration and repair of cells.