2.1. Samples
A total of 20 samples of liquid rennets prepared traditionally by cheesemakers were collected from different cheese factories in the Argos (11 samples marked as rennet A) and Attiki region (9 samples marked as rennet B). A general procedure of the rennet preparation was the following: Salted and dried wholeabomasa, which had been stored about one year at 4 ◦ C, were minced and macerated three to four times for 30 min to 24 h with water and salt at various ratios. The final product (liquid rennet) was the combined extracts with additional salt, which was kept at 4–5 ◦ C for a week at the maximum