not enough input argument error

I am trying to run this code, however, it seems that it's giving me a not enough input error (Not enough input arguments.

Error in repressilator (line 7), m1 = -y(1) + alpha/(1+y(6)^n) + alpha0;). Could someone please help me to run this?

function ydot=repressilator(t,y,p)
    alpha0 = 1;
    n = 2.0;
    beta = 5;
    alpha = 1000;
    % order of species; y = [m1 p1 m2 p2 m3 p3]
    m1 = -y(1) + alpha/(1+y(6)^n) + alpha0;
    p1 = -beta*(y(2) - y(1));
    m2 = -y(3) + alpha/(1+y(2)^n) + alpha0;
    p2 = -beta*(y(4) - y(3));
    m3 = -y(5) + alpha/(1+y(4)^n) + alpha0;
    p3 = -beta*(y(6) - y(5));
    ydot = [m1; p1; m2; p2; m3; p3];
    timespan=[0 15];

y0 = [0 1 0 1 0 1];
[t,y] = ode45(@repressilator,timespan,y0); 
figure()
plot(t,y)
xlabel('Time')
ylabel('Amount')
legend('m1','p1','m2','p2','m3','p3','Location','SouthEast')
figure()
plot(y(:,1), y(:,2)) 
xlabel('Amount m1')
ylabel('Amount p1')

Answer 1

[Stephan]

timespan=[0 15];
y0 = [0 1 0 1 0 1];
[t,y] = ode45(@repressilator,timespan,y0); 
figure()
plot(t,y)
xlabel('Time')
ylabel('Amount')
legend('m1','p1','m2','p2','m3','p3','Location','SouthEast')

figure()
plot(y(:,1), y(:,2)) 
xlabel('Amount m1')
ylabel('Amount p1')

function ydot=repressilator(~,y)
    alpha0 = 1;
    n = 2.0;
    beta = 5;
    alpha = 1000;
    % order of species; y = [m1 p1 m2 p2 m3 p3]
    m1 = -y(1) + alpha/(1+y(6)^n) + alpha0;
    p1 = -beta*(y(2) - y(1));
    m2 = -y(3) + alpha/(1+y(2)^n) + alpha0;
    p2 = -beta*(y(4) - y(3));
    m3 = -y(5) + alpha/(1+y(4)^n) + alpha0;
    p3 = -beta*(y(6) - y(5));
    ydot = [m1; p1; m2; p2; m3; p3];
end 

[aubelee]

it gives me :>> repressilator(y, p)

Unrecognized function or variable 'y'.

[Stephan]

See my edited answer - the code works