All of the following are involved in adaptive immunity EXCEPT:

A substance used to enhance antibody formation is called:

Match the definitions with the terms. 

What type of article is this?      

Climate change may alter sex ratios in some reptiles because:

In a classic morphogen gradient model, different cell fates arise because:

In early mammalian development:

Dahlia has an external female phenotype, but finds out later in life that she has XY chromosomes. An MRI reveals the presence of undescended testes. Which of the following is a genetic change that could have caused this phenotype? If needed, consult the model for gonadal sex determination in mammals below. A black arrow means that the activity of one member is enhanced by another (for example, Wnt4 enhances Beta-catenin activity). A red line with a perpendicular line at the end means that the activity of one member is inhibited by another (for example, Beta-catenin inhibits Sox9 activity). 

Is developmental biology equivalent to the study of embryos?

Q: Match each motor protein with its primary cytoskeletal track and function.