- CNA is the fundamental genetic material of the Transformer species in some continuities.
References to it, however, are very scarce in Fictions, and thus like the far more commonly-referenced sparks can only be said to definitively exist in continuities where it is actually mentioned. To date, the specific nomenclature "CNA" has only been used in one continuity.
The existence of Transformer genetic material is mentioned and seen when Perceptor and others are analyzing the Swarm. They note that its genetic material and cellular structure are identical to that of the Transformers species.
Megatron was able to create a sapient clone of Dinobot with simply "a speck of [his] DNA", seemingly indicating that both the robotic and organic "genetics" were present in the DNA sample. Although the clone possessed a semblance of the original Dinobot's personality, his voice and possibly his memories, the clone did not however have a robot mode it was capable of transforming into, a fact which has unclear implications.
The term CNA is used here as well to refer to the genetic material from which Shockwave cloned the Predacons. Here it is stated to stand for cybernucleic acid, much like in human nomenclature DNA and RNA stand for deoxyribonucleic acid and ribonucleic acid respectively.