“…The exact composition of complex organics, such as casein hydrolysate, casamino acids, coconut water, and yeast extract, is typically undefined and varies depending on the manufacturer/supplier and potentially the batch. However, the amino acids, hormones, vitamins, fatty acids, carbohydrates, and other growth supplements they provide may enhance growth and regeneration of plants ( Bhatia, 2015 ). The addition of casein hydrolysate was initially shown to give a more consistent high rate of microcallus formation from tobacco ( Nicotiana tabacum ) protoplasts ( Galun and Raveh, 1975 ), and is currently an addition to protoplast culture media regularly ( Table 2 ).…”