The vast majority of cortical GABAergic neurons can be defined by parvalbumin. somatostatin or calretinin expression. In most mammalians parvalbumin and somatostatin interneurons have constant proportions. each representing 5-7% of the total neuron number. https://www.alarecre.com/Looney-Tunes-Marvin-the-Martian-Big-Head-Galaxy-S23-Waterproof-Case-p116784/