Retinoid

 Retinoid receptor khususnya kita panggil RXR boleh bergabung dgn receptor lain dalam badan.

Retinoid receptor boleh bergabung dgn sex hormone, thyroid hormone, vitamin D receptor dll. Kalau dua molecule protein receptor yang berbeza bergabung jadi satu kita panggil heterodimer

Although the perinatal period is the most critical for faulty imprinting, there are other critical periods as weaning and adolescence, when the original imprinting can be modified or new imprintings develop.'

Retinol = endocrine disruptor