| PI | first meiotic prophase; isoelectric point; pacing impulse; package insert; pancreatic insufficiency;... |
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| prophase i | The first stage in the first meiotic division of meiosis. The individual chromosomes of the cell become clearly visible within the nucleus with a light microscope as they condense from long, thin, wispy structures to thick structures, and they appear as a tangled jumble of paired, identical chromatids. Prophase ends with the disappearance of the nuclear membrane. This is identical to the prophase stage of mitosis. (09 Oct 1997) |
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| prophase II | The first stage in the second meiotic division of meiosis, following telophase I. In each of the two cells which were produced by the first meiotic division, the chromosomes migrate towards the cells centre. The stage ends when the chromosomes are aligned along a single plane in the centre of each cell. (09 Oct 1997) |
| prophase | Classical term for the first phase of mitosis or of one of the divisions of meiosis. During this phase the chromosomes condense and become visible. (18 Nov 1997) |
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