Abstract: Described herein are methods and compositions related to promoting maturation of in vitro-differentiated cardiomyocytes and in vitro-differentiated neurons, and methods and compositions using the resulting cardiomyocytes and neurons.

Abstract: A meter circuit apparatus and a method for implementing metering are disclosed, wherein the apparatus includes: an electric energy meter (1), a combining unit (2) and a current transformer (3), wherein the current transformer (3) is connected to the combining unit (2) and the electric energy meter (1) and is configured to acquire an electrical quantity of a intelligent substation, and input the electrical quantity to the combining unit (2) and the electric energy meter (1); the combining unit (2) configured to combine and synchronize the electrical quantity inputted by the current transformer (3), and forward a processed digital signal in a specific format; and the electric energy meter (1) is configured to charge for the electrical quantity inputted by the current transformer (3). Requirements of regular metering and intelligent measurement are satisfied within adding an independent current transformer (3).