True or false: the two deposition methods of direct cell writing are drop-on-demand and continuing.

The statement is true because the two primary deposition methods for direct cell writing are indeed drop-on-demand and continuous methods.

In the drop-on-demand approach, cells or biomaterials are deposited as discrete droplets, typically by using a print head that can control the timing and amount of material ejected. This method allows for precise placement of cells and materials, making it suitable for creating complex, patterned structures needed in tissue engineering applications.

On the other hand, continuous deposition involves a steady flow of cells or materials, allowing for a more consistent and uninterrupted formation of filaments or layers. This method can be advantageous for creating larger constructs or scaffolds where maintaining a continuous supply of cells is beneficial.

Thus, both methods serve distinct purposes and are integral to the field of direct cell writing in tissue engineering, confirming that the statement is accurate.