In a mind seed, a field where only one instruction code has been tested, and the effects of any variation are unknown.

In a mind seed, a field where one particular instruction code is known to be essential for successful psychogenesis.

In a mind seed, a field where a number of different instruction codes are known to produce safe variations of some trait.

Instructions consisted of 20-bits; an 8-bit instruction code and 12-bits for addressing.

Ten bits of each word were allocated to hold the instruction code.

Since the computer's memory is able to store numbers, it can also store the instruction codes.

The location of this required data is typically stored within the instruction code.

The instruction code can be chosen from whatever method is most easy to decode and "fits in the width of the memory".

Your genes are instruction codes for your body-telling cells what to do.

These instruction codes do everything, from telling your body when to start puberty to determining the shape of your nose.