According to current understanding, the contralateral organization is due to an axial twist ( see below), which is the only theory that has been tested independently.
<meaning-changed> According to current understanding, the contralateral organization is due to an axial twist ( see below), which is the only theory that has been tested independently.
According to current understanding, the contralateral organization is due to an axial twist ( explained further below), which is the only theory that has been tested independently.