"This type binding pocket is between the proteins folds and open to sides. The binding pocket is like a canyon."
A whole list of binding pocket types is listed in the linked thesis. See page 50.
METAMIA is a free database of analogy and metaphor. Anyone can contribute or search. The subject matter can be anything. Science is popular, but poetry is encouraged. The goal is to integrate our fluid muses with the stark literalism of a relational database. Metamia is like a girdle for your muses, a cognitive girdle.