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Euchromatin and Heterochromatin
Euchromatin and heterochromatin are very typical examples of chromosome regions that are generally treated as segments. Since the demarkation of eu- and heterochromatin is such a typical component of karyotype analysis, MicroMeasure treats this type of analysis separately from other segment types (up to 12 additional segment types may be defined: see Using Segments for more information).
Marking Eu- and Heterochromatin
Like all other structures, regions of eu-and heterochromatin must be marked along chromosomes as they are encountered. It is not possible in the current version of MM to add such regions after a chromosome has been marked without retracing the entire chromosome.
Segments are marked in much the same fashion as points. The only major difference is that both the start and end of each segment is must be marked. When the start of a segment is encountered, it may be marked by selecting the appropriate item from the Points menu, or by right-clicking and selecting the point type from the context menu. Marking continues as usual until the end of the segment is reached, with is then marked the same way.
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