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thumb|Shown is a micrograph of an amoeba; the darker pink nucleus is central to the eukaryotic cell, with the majority of the rest of the cell's body belonging to the endoplasm. Though not visible, the ectoplasm resides directly internal to the plasma membrane. Endoplasm, also known as entoplasm, generally refers to the inner (often granulated), dense part of a cell's cytoplasm. The nucleus is separated from the endoplasm by the nuclear envelope. In an amoeba and other protists the outer part of the cytoplasm is known as the ectoplasm. The different makeups/viscosities of the endoplasm and ect