Perhaps this article gives some clues (What if the Rona Virus designed by Gain-of-Function targets "this system"? And therefore Ivermectin and Artemisia Annua as treatments against parasites/viruses/bacteria are so helpful?):
"You Are Barely You - We like to imagine that life is simple. A single egg-and-sperm combination carries all of the genetic materials that create us. It is the foundation of who we are, whether we’re a single cell, a newborn baby or a fully grown adult.
But the reality isn’t as simple. For example, you might know that bacteria inhabit our gut and help us with the process of digestion. Funny side effect: those bacteria affect your physical health (obesity, diabetes, etc.) as well as your mental health (autism, anxiety, depression). Also, those bacteria aren’t the only ones that inhabit us; in fact, microorganisms outnumber our own body’s cells 10 to 1. ...
... With that perspective in mind, it shouldn’t be so hard to believe that not much of your DNA is yours, either. A huge chunk of your DNA comes from viruses. Approximately 5% to 8% of the human genome comes from ancient viruses. Viral-based genetic code affects the bodies in ways you might’ve never thought about. For example, viral-based genetic code regulates hormones in a female’s body that control birth timing. And yes, you’ve probably guessed where I’m headed — viral-based genetic code has recently been linked as a catalyst to intelligence. Specifically, it’s the ancestors of retroviruses, retrotransposons, that are the ones that found their way into an evolutionary symbiosis with our brains (as well as other aspects of us).
Viruses hijack cells like pirates hijack ships."
https://towardsdatascience.com/the-origins-and-future-of-intelligence-chapter-2-c10097b362ca
"We have been able to observe that these viruses are activated specifically in the brain cells and have an important regulatory role. We believe that the role of retroviruses can contribute to explaining why brain cells in particular are so dynamic and multifaceted in their function. It may also be the case that the viruses' more or less complex functions in various species can help us to understand why we are so different," says Johan Jakobsson, head of the research team for molecular neurogenetics at Lund University. ..."
https://www.sciencedaily.com/releases/2015/01/150112093129.htm
Perhaps this article gives some clues (What if the Rona Virus designed by Gain-of-Function targets "this system"? And therefore Ivermectin and Artemisia Annua as treatments against parasites/viruses/bacteria are so helpful?):
"You Are Barely You - We like to imagine that life is simple. A single egg-and-sperm combination carries all of the genetic materials that create us. It is the foundation of who we are, whether we’re a single cell, a newborn baby or a fully grown adult.
But the reality isn’t as simple. For example, you might know that bacteria inhabit our gut and help us with the process of digestion. Funny side effect: those bacteria affect your physical health (obesity, diabetes, etc.) as well as your mental health (autism, anxiety, depression). Also, those bacteria aren’t the only ones that inhabit us; in fact, microorganisms outnumber our own body’s cells 10 to 1. ...
... With that perspective in mind, it shouldn’t be so hard to believe that not much of your DNA is yours, either. A huge chunk of your DNA comes from viruses. Approximately 5% to 8% of the human genome comes from ancient viruses. Viral-based genetic code affects the bodies in ways you might’ve never thought about. For example, viral-based genetic code regulates hormones in a female’s body that control birth timing. And yes, you’ve probably guessed where I’m headed — viral-based genetic code has recently been linked as a catalyst to intelligence. Specifically, it’s the ancestors of retroviruses, retrotransposons, that are the ones that found their way into an evolutionary symbiosis with our brains (as well as other aspects of us).
Viruses hijack cells like pirates hijack ships."
https://towardsdatascience.com/the-origins-and-future-of-intelligence-chapter-2-c10097b362ca