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The Fragment Selection view in the ligand design panel. The Functional Groups fragments are displayed.

Fragment Selection is one of the features of the ligand design panel in small molecule design puzzles. The ligand design panel can toggle between Fragment Selection and Atom Selection views.

The Fragment Selection panel also includes these separate areas:

Fragment Selection involves selecting one or more atoms of ligand, and adding a chemical fragment.

Fragments can be selected from these categories:

The categories are represented by icons above the Atom Selection button. The selected category is highlighted, and its fragments appear as icons under the words "Fragment Selection".

Clicking a fragment opens the Attachment Panel, allowing fine-tuning of how the fragment is positioned.