The active component of ripened hematoxylin that binds to tissue structures is called what?

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Multiple Choice

The active component of ripened hematoxylin that binds to tissue structures is called what?

Explanation:
Hematein. When hematoxylin is ripened (oxidized), it becomes hematein, which then forms a complex with a mordant such as aluminum in the tissue. This hematein–mordant complex binds to tissue structures, especially nucleic acids in nuclei, producing the characteristic blue/purple nuclear stain. The other substances are different dyes and do not represent the active binding form in this stain—malachite green is used in other contexts, eosin is a counterstain, and hematoxylin by itself is not the active binding species without oxidation.

Hematein. When hematoxylin is ripened (oxidized), it becomes hematein, which then forms a complex with a mordant such as aluminum in the tissue. This hematein–mordant complex binds to tissue structures, especially nucleic acids in nuclei, producing the characteristic blue/purple nuclear stain. The other substances are different dyes and do not represent the active binding form in this stain—malachite green is used in other contexts, eosin is a counterstain, and hematoxylin by itself is not the active binding species without oxidation.

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