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alex.forencich
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Why are current sources not drawn explicitly in the datasheets' schematic diagrams?

Below is a schematic diagram given for an IC in its datasheet:

enter image description here

As you can see everything is drawn in detail in transistor level. I can see many BJT transistors and diodes for instance.

But the 3.5uA and 100uA current sources are not drawn in transistor level. Why are the current sources hidden here and shown only as a current source symbol? Why are not they drawn explicitly?