Both Logan and genetically modified Max refer to her as a chimera. While she is transgenic it is quite possible every one of her cells has the same complement of genes. A chimera has part of its body one gene set and other part a different set. Example, some folks have one DNA fingerprint for their saliva and another fingerprint for their blood. Such folks started as two separate fertilized eggs which later fused into one embryo.
Tryptophan is an essential amino acid which everyone needs in their diet. Since Max needs more tryptophan than her diet provides she must take supplement pills. Logan mistakenly says tryptophan serves as a neurotransmitter. It is merely the basic molecule from which the body makes the neurotransmitters serotonin and melatonin.