Ectoplasm

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What Wikipedia says

Ectoplasm, also called exoplasm, is the clear, gel-like, and agranular outer portion of the cytoplasm in protists, that lies just beneath the cell membrane. In other eukaryotes it is known as the cell cortex. It contains actin filaments, allowing the ectoplasm to play a significant role in cellular movement and shape.

Excerpt from the Wikipedia article “Ectoplasm (cell biology)”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Edmund Beecher Wilson (1856–1939), Public domain, via Wikimedia Commons.