This structure is a double lipid bi-layer that surrounds the nucleus. One way to think of a mammalian cell is as a Russian nesting doll with three dolls. The these particular cell are 3-dimensional structures encapsulated inside each other.
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.