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"Human mechanistic studies were too heterogenous and limited in number to make any determination on biological plausibility," the authors state, essentially saying we don't know yet.

While MDD is a heterogenous disorder with no one fits all solution, it is important to emphasize that if a treatment or medication is working for you, then they are lifesaving.

But that doesn't mean Arctic permafrost is nothing to worry about -- on the contrary, the study clearly shows that the permafrost zone is very heterogenous.

The bottom line: these assemblies are much more complicated and heterogenous than anticipated.

In their prior stem cell differentiation process, the low efficiency resulted in heterogenous cell populations, making them difficult to sort and to obtain enough for other research or clinical applications.