diff --git a/Project.toml b/Project.toml
index 63069e8..68de75b 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,7 +1,7 @@
 name = "EpithelialDynamics1D"
 uuid = "ace8a2d7-7779-48a6-a8a4-cf6831a7e55b"
 authors = ["Daniel VandenHeuvel <danj.vandenheuvel@gmail.com>"]
-version = "1.7.1"
+version = "1.7.2"
 
 [deps]
 CommonSolve = "38540f10-b2f7-11e9-35d8-d573e4eb0ff2"
diff --git a/src/equations.jl b/src/equations.jl
index bd87966..279f56e 100644
--- a/src/equations.jl
+++ b/src/equations.jl
@@ -7,21 +7,22 @@ function cell_odes!(dr, r, prob, t)
     p = prob.force_law_parameters
     for i in (firstindex(dr)+1):(lastindex(dr)-1)
         δᵢ₋₁ = r[i] - r[i-1]
-        δᵢ₊₁ = r[i] - r[i+1]
-        Fᵢ₋₁ = F(abs(δᵢ₋₁), p) * sign(δᵢ₋₁)
-        Fᵢ₊₁ = F(abs(δᵢ₊₁), p) * sign(δᵢ₊₁)
-        dr[i] = η⁻¹ * (Fᵢ₋₁ + Fᵢ₊₁)
+        δᵢ = r[i+1] - r[i]
+        Fᵢ₋₁ = F(δᵢ₋₁, p)
+        Fᵢ = F(δᵢ, p)
+        dr[i] = η⁻¹ * (Fᵢ₋₁ - Fᵢ)
     end
     if !fix_left
-        δ₁ = r[begin] - r[begin+1]
-        F₁ = F(abs(δ₁), p) * sign(δ₁)
-        dr[begin] = η⁻¹ * F₁
+        δ₁ = r[begin+1] - r[begin]
+        F₁ = F(δ₁, p)
+        dr[begin] = -η⁻¹ * F₁
+
     else
         dr[begin] = zero(dr[begin])
     end
     if !fix_right
         δₙ₋₁ = r[end] - r[end-1]
-        Fₙ₋₁ = F(abs(δₙ₋₁), p) * sign(δₙ₋₁)
+        Fₙ₋₁ = F(δₙ₋₁, p)
         dr[end] = η⁻¹ * Fₙ₋₁
     else
         dr[end] = zero(dr[end])